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x/2+20x+2x+15x/2=90
We move all terms to the left:
x/2+20x+2x+15x/2-(90)=0
We add all the numbers together, and all the variables
22x+x/2+15x/2-90=0
We multiply all the terms by the denominator
22x*2+x+15x-90*2=0
We add all the numbers together, and all the variables
16x+22x*2-180=0
Wy multiply elements
16x+44x-180=0
We add all the numbers together, and all the variables
60x-180=0
We move all terms containing x to the left, all other terms to the right
60x=180
x=180/60
x=3
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