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-x+63=3x+31
We move all terms to the left:
-x+63-(3x+31)=0
We add all the numbers together, and all the variables
-1x-(3x+31)+63=0
We get rid of parentheses
-1x-3x-31+63=0
We add all the numbers together, and all the variables
-4x+32=0
We move all terms containing x to the left, all other terms to the right
-4x=-32
x=-32/-4
x=+8
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