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-3(1+3x)=-5x-31
We move all terms to the left:
-3(1+3x)-(-5x-31)=0
We add all the numbers together, and all the variables
-3(3x+1)-(-5x-31)=0
We multiply parentheses
-9x-(-5x-31)-3=0
We get rid of parentheses
-9x+5x+31-3=0
We add all the numbers together, and all the variables
-4x+28=0
We move all terms containing x to the left, all other terms to the right
-4x=-28
x=-28/-4
x=+7
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