Решите уравнение : а) -8 (11-2а) + 40 = 3 (5а-4) б) 7 (-3 ( m-2)-m)-12=4 (5-3m)-4

Question

Решите уравнение : а) -8 (11-2а) + 40 = 3 (5а-4) б) 7 (-3 ( m-2)-m)-12=4 (5-3m)-4

Answer 1

-8(11-2a)+40=3(5a-4)
-88-16a+40=15a-12
-16a+15a=-12+48
-1a=36
a=36÷(-1)
a=-36

7(-3(m-2)-m)-12=4(5-3m)-4
7(-3m+6-m)-12=20-12m-4
7(-4m+6)-12=16-12m
-28m+42-12=16-12m
-28m+12m=16-30
-16m=-14
m=14/16
m=7/8