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3x=15| :3
x=5
4x-12=0
4x= 12+0
4x=12|:4
x=3
7-x=5
-x= -7+5
-x=-2 | :(-1)
x=2
b) 4x-12=0 ; x-3=0 ; 8x - 24 =0
c) 7-x=5 ; 14 -2x = 5, 21 - 3x = 5
3x=15 /:3
x=5
b)4x-12=0
4x=12+0
4x=12 / :4
x=3
c)7-x=5
-x=-7+5
-x=-2 / :(-1)
x=2