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15.99+9.99x=100
We move all terms to the left:
15.99+9.99x-(100)=0
We add all the numbers together, and all the variables
9.99x-84.01=0
We move all terms containing x to the left, all other terms to the right
9.99x=84.01
x=84.01/9.99
x=8+3.75229357798/9.16513761468
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