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90-x=47+3x
We move all terms to the left:
90-x-(47+3x)=0
We add all the numbers together, and all the variables
-x-(3x+47)+90=0
We add all the numbers together, and all the variables
-1x-(3x+47)+90=0
We get rid of parentheses
-1x-3x-47+90=0
We add all the numbers together, and all the variables
-4x+43=0
We move all terms containing x to the left, all other terms to the right
-4x=-43
x=-43/-4
x=10+3/4
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