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3(х+5)=3х+15
(3+5)х=3х+5х
(7+х)*5=7*5+8*5
(х+2)*4=2*4+2*4
(5-3)х=5х-3х
(5-3)х=5х-3*2

3(х+5)=3х+15
3х+15=3х+15
3х-3х=15-15
0=0

(3+5)х=3х+5х
8х=8х
8х-8х=0
0=0

(7+х)×5=7×5+8×5
35+5х=35+40
5х=75-35
5х=40
х=8

(х+2)×4=2×4+2×4
4х+8=8+8
4х=16-8
4х=8
х=2

(5-3)х=5х-3х
2х=2х
2х-2х=0
0=0

(5-3)х=5х-3×2
2х-5х=-6
-3х=-6
х=2