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13x-151=4x-7
We move all terms to the left:
13x-151-(4x-7)=0
We get rid of parentheses
13x-4x+7-151=0
We add all the numbers together, and all the variables
9x-144=0
We move all terms containing x to the left, all other terms to the right
9x=144
x=144/9
x=16
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