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90+.8x=30+.9x
We move all terms to the left:
90+.8x-(30+.9x)=0
We add all the numbers together, and all the variables
.8x-(.9x+30)+90=0
We get rid of parentheses
.8x-.9x-30+90=0
We add all the numbers together, and all the variables
-0.1x+60=0
We move all terms containing x to the left, all other terms to the right
-0.1x=-60
x=-60/-0.1
x=+600
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