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X-(X*0.13)=91
We move all terms to the left:
X-(X*0.13)-(91)=0
We add all the numbers together, and all the variables
X-(+X*0.13)-91=0
We get rid of parentheses
X-X*0.13-91=0
Wy multiply elements
X-0.13X-91=0
We add all the numbers together, and all the variables
0.87X-91=0
We move all terms containing X to the left, all other terms to the right
0.87X=91
X=91/0.87
X=104+0.52/0.87
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