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0.4x+0.15(100-x)=36
We move all terms to the left:
0.4x+0.15(100-x)-(36)=0
We add all the numbers together, and all the variables
0.4x+0.15(-1x+100)-36=0
We multiply parentheses
0.4x-0.15x+15-36=0
We add all the numbers together, and all the variables
0.25x-21=0
We move all terms containing x to the left, all other terms to the right
0.25x=21
x=21/0.25
x=84
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