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X=90+0.3X
We move all terms to the left:
X-(90+0.3X)=0
We add all the numbers together, and all the variables
X-(0.3X+90)=0
We get rid of parentheses
X-0.3X-90=0
We add all the numbers together, and all the variables
0.7X-90=0
We move all terms containing X to the left, all other terms to the right
0.7X=90
X=90/0.7
X=128+0.4/0.7
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