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x+3.5x+x/2=90
We move all terms to the left:
x+3.5x+x/2-(90)=0
We add all the numbers together, and all the variables
4.5x+x/2-90=0
We multiply all the terms by the denominator
(4.5x)*2+x-90*2=0
We add all the numbers together, and all the variables
(+4.5x)*2+x-90*2=0
We add all the numbers together, and all the variables
x+(+4.5x)*2-180=0
We multiply parentheses
x+8x-180=0
We add all the numbers together, and all the variables
9x-180=0
We move all terms containing x to the left, all other terms to the right
9x=180
x=180/9
x=20
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