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3x-10(x=2)=13-7x
We move all terms to the left:
3x-10(x-(2))=0
We multiply parentheses
3x-10x+20=0
We add all the numbers together, and all the variables
-7x+20=0
We move all terms containing x to the left, all other terms to the right
-7x=-20
x=-20/-7
x=2+6/7
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