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x+2+x+4+2x+10=90
We move all terms to the left:
x+2+x+4+2x+10-(90)=0
We add all the numbers together, and all the variables
4x-74=0
We move all terms containing x to the left, all other terms to the right
4x=74
x=74/4
x=18+1/2
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