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13.15x+90=11.85x+100
We move all terms to the left:
13.15x+90-(11.85x+100)=0
We get rid of parentheses
13.15x-11.85x-100+90=0
We add all the numbers together, and all the variables
1.3x-10=0
We move all terms containing x to the left, all other terms to the right
1.3x=10
x=10/1.3
x=7+0.9/1.3
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