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