6) 53y + 18y — 24y; 7) 14m + 15m + 16; 3) 34a — a;​

5) -5m + 24 = m;
814. 1) 12a — 1= -a + 25;
3) 8 + 3b = -7 + 2b;
5) 3y — 3 = 5 — y;
15. 1) 2x + 3 = x — 6;
1
-​

1)-18 (2-x) + 20 =
2) 14 (70)-90-
3) 12 (+1)+50-
4) 42-7(8+y)
. 5) 21 -4(x-8 ) —
6.) 8 — (h (6 +16) -4) (18+%)+(-b — (8) = Daly-5) -119 +у). 2b 80 9) — 4/6 — 2) + 5 (5(-7) –​

a) 7(5a +8)-11a;

6) 4(y-3)-4y+15;

B) 13a-8(7a-1).

815. 1) 2x + 3 = x — 6; 3) 5 — 3y = 4 — 2y; 5) 6a — 1 = 3a + 7; 2) z + 4-3 = 2z; 4) 7 — 3x = 4x — 9; 6) 10y — 3 = 5 + 3y.​

(2) (432+b) — 265;

(3) (a +457) + (143 +872);

(4) 96 (m + 48);

(5) 516 (216- x);

(6) (5432+8951) + (4568 + a + 1049).

a) (3x + 4)(3x — 4) + x²; 6) (5y — 1)(5y + 1) − 3y²; B) 6a² + (-7-4a)(−7 + 4a); r) 4,3m² + (-2m-3)(2m-3).​

a) 21 + 8:2 =
b) 3.5 — 8 =
c) 143:11 + 7 =
d) 13.5 — 47 =
e) 99 · 11 – 7.41 =
g) 315:3.4 + 12 =
h) 512 — 129 — 8:3 =
f) 34 : 2 + 7 · 14 =
i) 19.5 + 72:3.5 =
j) 4.17 — 21 — 4:7-7.6 =​

1) 7x — 4 = x — 16
2) 13 — 5x = 8 — 2x
3) 0,2(x — 3) – 1 = 0,5(x +3) – 0,4
4) 12 = (7x — 9) — (11 — x)​

-3(2x+3y)+7(-2x+4y)= -(7a+b)-8a-3b)=
-2(3x-1)+3(5-7x)=
-4(a-1)-5(2+a)=
7(x-4)-3(5+3x)=

(2y +6):3 — 4=y: 2 + 1;
(y: 7-3). 6 + 64 = 2y — 18;
(98 – 4y): 15.8= 24y.​