Explicação passo-a-passo:
a)4x+2x=9+4
6x=13
x=6÷13
x= 0,46
b)6x+x-5x=3-3
2x=0
x=2÷0
x=1
c)2x+8x=4-3
10x=1
d)2x-4x=6-3+5
-2x=8
2x=-8
x=-8÷2
x =-4
e)5x-7x=10-2
-2x=8
2x=-8
x =-8÷2
x=-4
f)6x-3x+x=8+7
4x=15
x=15÷4
x=3,75
g)7x+3x=5-14
10x=-9
x=-9÷10
x=-0.9
h)5x+2x-4x=8-3
3x=5
x=5÷3
x=1.666....
i)3x+2x=9-3
5x=6
x=6÷5
x=1.2
j)3x+2x=9-3
5x=6
x=6÷5
x=1.2
k)12x-7x=6-7
5x=-1
x=-1÷5
x=0.2
