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144+4x=90+x
We move all terms to the left:
144+4x-(90+x)=0
We add all the numbers together, and all the variables
4x-(x+90)+144=0
We get rid of parentheses
4x-x-90+144=0
We add all the numbers together, and all the variables
3x+54=0
We move all terms containing x to the left, all other terms to the right
3x=-54
x=-54/3
x=-18
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