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x/2+12+x=90
We move all terms to the left:
x/2+12+x-(90)=0
We add all the numbers together, and all the variables
x+x/2-78=0
We multiply all the terms by the denominator
x*2+x-78*2=0
We add all the numbers together, and all the variables
x+x*2-156=0
Wy multiply elements
x+2x-156=0
We add all the numbers together, and all the variables
3x-156=0
We move all terms containing x to the left, all other terms to the right
3x=156
x=156/3
x=52
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