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x=87+0.39999999999999/0.8
We move all terms to the left:
x-(87+0.39999999999999/0.8)=0
We add all the numbers together, and all the variables
x-(0.39999999999999/0.8+87)=0
We get rid of parentheses
x-87-0.39999999999999/0.8=0
We multiply all the terms by the denominator
x*0.8-0.39999999999999-87*0.8=0
We add all the numbers together, and all the variables
x*0.8-70=0
Wy multiply elements
0.8x-70=0
We move all terms containing x to the left, all other terms to the right
0.8x=70
x=70/0.8
x=87+0.39999999999999/0.8
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