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2x+3(-5x+1)=81
We move all terms to the left:
2x+3(-5x+1)-(81)=0
We multiply parentheses
2x-15x+3-81=0
We add all the numbers together, and all the variables
-13x-78=0
We move all terms containing x to the left, all other terms to the right
-13x=78
x=78/-13
x=-6
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