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90-x=705-4x
We move all terms to the left:
90-x-(705-4x)=0
We add all the numbers together, and all the variables
-x-(-4x+705)+90=0
We add all the numbers together, and all the variables
-1x-(-4x+705)+90=0
We get rid of parentheses
-1x+4x-705+90=0
We add all the numbers together, and all the variables
3x-615=0
We move all terms containing x to the left, all other terms to the right
3x=615
x=615/3
x=205
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