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15x+4=13x+8
We move all terms to the left:
15x+4-(13x+8)=0
We get rid of parentheses
15x-13x-8+4=0
We add all the numbers together, and all the variables
2x-4=0
We move all terms containing x to the left, all other terms to the right
2x=4
x=4/2
x=2
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