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x-3(7x+4)+3(x-1)=-355
We move all terms to the left:
x-3(7x+4)+3(x-1)-(-355)=0
We add all the numbers together, and all the variables
x-3(7x+4)+3(x-1)+355=0
We multiply parentheses
x-21x+3x-12-3+355=0
We add all the numbers together, and all the variables
-17x+340=0
We move all terms containing x to the left, all other terms to the right
-17x=-340
x=-340/-17
x=+20
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