7(х+6)=49 3(2х-9)=27 2(2х+3х)=20

Question

7(х+6)=49 3(2х-9)=27 2(2х+3х)=20

Answer 1

7x+42=49
7x=7
x=1

6x-27=27
6x=51
x=9

4x+6x=20
10x=20
x=2

Comments

ой, 7х=7. х=1

Answer 2

7 (×+6)=49
×+6=49÷7
×+6=7
×=7-6
×=1

3 (2×-9)=27
2×-9=27÷3
2×-9=9
×=(9+9)÷2
×=9


2 (2×+3×)=20
2×+3×=20÷2
5×=10
×=10÷5
×=2