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X+5(X+5)=70
We move all terms to the left:
X+5(X+5)-(70)=0
We multiply parentheses
X+5X+25-70=0
We add all the numbers together, and all the variables
6X-45=0
We move all terms containing X to the left, all other terms to the right
6X=45
X=45/6
X=7+1/2
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