(a) m = 9/5

(b) y = -1

(c) x = -17/3

(d) y = -5/7

Explicação passo-a-passo:

(a)

9m-6 = 4m+3

9m-4m-6-3 = 0

5m-9=0

5m=9

m=9/5

(b)

10y+7 = -2y-5

10y+2y+7+5 = 0

12y+12 = 0

12y = -12

y = -12/12

y = -1

(c)

4.(2x+3) = 5.(x-1)

8x+12 = 5x-5

8x-5x+12+5 = 0

3x+17 = 0

3x = -17

x = -17/3

(d)

5.(3y-1) = 2.(4y-5)

15y-5 = 8y-10

15y-8y-5+10 = 0

7y+5 = 0

7y = -5

y = -5/7