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x+12*4=2x-90
We move all terms to the left:
x+12*4-(2x-90)=0
We add all the numbers together, and all the variables
x-(2x-90)+48=0
We get rid of parentheses
x-2x+90+48=0
We add all the numbers together, and all the variables
-1x+138=0
We move all terms containing x to the left, all other terms to the right
-x=-138
x=-138/-1
x=+138
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