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90=90+90+64+x
We move all terms to the left:
90-(90+90+64+x)=0
We add all the numbers together, and all the variables
-(x+244)+90=0
We get rid of parentheses
-x-244+90=0
We add all the numbers together, and all the variables
-1x-154=0
We move all terms containing x to the left, all other terms to the right
-x=154
x=154/-1
x=-154
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