Question

Quanto e
A) 7a - 12×(a-7) = -2

B) 12x-6+8=5x- 3/2

C) 2.(x-12) = 7 (x-15)

D) 5×/2 + 1/3 = 2x

E) 19 - 3x + 2/9 = 0

F) 5×(5/2 + x/2 = 15

Answer 1

a)7a-12(a-7)=-2
7a-12a+84=-2
5a=-2-84
5a=-86
a=86/5

b)12x-6+8=5x-3/2
12x+2=5x-3/2
12x-5x=-3/2-2
7x=7/2
x=1/2

c)2(x-12)=7(x-15)
2x-24=7x-105
2x-7x=-105+24
5x=81
×=81/5

d)5x/2+1/3=2x
15x+2=12x
15x-12x=-2
3x=-2
x=2/3

e) 19-3x+2/9=0
173/9-3x=0
-3x=-173/9
x=173/27