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0.40x+0.15(100-x)=25
We move all terms to the left:
0.40x+0.15(100-x)-(25)=0
We add all the numbers together, and all the variables
0.40x+0.15(-1x+100)-25=0
We multiply parentheses
0.40x-0.15x+15-25=0
We add all the numbers together, and all the variables
0.25x-10=0
We move all terms containing x to the left, all other terms to the right
0.25x=10
x=10/0.25
x=40
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