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290=x+4x
We move all terms to the left:
290-(x+4x)=0
We add all the numbers together, and all the variables
-(+5x)+290=0
We get rid of parentheses
-5x+290=0
We move all terms containing x to the left, all other terms to the right
-5x=-290
x=-290/-5
x=+58
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