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13x+7=4x+43
We move all terms to the left:
13x+7-(4x+43)=0
We get rid of parentheses
13x-4x-43+7=0
We add all the numbers together, and all the variables
9x-36=0
We move all terms containing x to the left, all other terms to the right
9x=36
x=36/9
x=4
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