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x/2+7x=90
We move all terms to the left:
x/2+7x-(90)=0
We add all the numbers together, and all the variables
7x+x/2-90=0
We multiply all the terms by the denominator
7x*2+x-90*2=0
We add all the numbers together, and all the variables
x+7x*2-180=0
Wy multiply elements
x+14x-180=0
We add all the numbers together, and all the variables
15x-180=0
We move all terms containing x to the left, all other terms to the right
15x=180
x=180/15
x=12
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