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124=3x-4+5x
We move all terms to the left:
124-(3x-4+5x)=0
We add all the numbers together, and all the variables
-(8x-4)+124=0
We get rid of parentheses
-8x+4+124=0
We add all the numbers together, and all the variables
-8x+128=0
We move all terms containing x to the left, all other terms to the right
-8x=-128
x=-128/-8
x=+16
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