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15x-149=7x+123
We move all terms to the left:
15x-149-(7x+123)=0
We get rid of parentheses
15x-7x-123-149=0
We add all the numbers together, and all the variables
8x-272=0
We move all terms containing x to the left, all other terms to the right
8x=272
x=272/8
x=34
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