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5(13+x)=15
We move all terms to the left:
5(13+x)-(15)=0
We add all the numbers together, and all the variables
5(x+13)-15=0
We multiply parentheses
5x+65-15=0
We add all the numbers together, and all the variables
5x+50=0
We move all terms containing x to the left, all other terms to the right
5x=-50
x=-50/5
x=-10
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