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-x+3(3x-10)=50
We move all terms to the left:
-x+3(3x-10)-(50)=0
We add all the numbers together, and all the variables
-1x+3(3x-10)-50=0
We multiply parentheses
-1x+9x-30-50=0
We add all the numbers together, and all the variables
8x-80=0
We move all terms containing x to the left, all other terms to the right
8x=80
x=80/8
x=10
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