Question

quanto é :

2×+1=4×-7

9×+9+3×+=15

16×-1=12×+3

3×-2=4×+9

Answer 1

A)2x+1=4x-7
2x-4x=-7-1
-2x=-8 *(-1)
2x=8
x=8/2=4

B)9x+9+3x=15
9x+3x=15-9
12x=6
x=6/12

C)16x-1=12x+3
16x-12x=3+1
4x=4
x=4/4=1

D)3x-2=4x+9
3x-4x=9+2
-1x=11 *(-1)
x=-11