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0.02x+0.10(20-x)=20(0.035
We move all terms to the left:
0.02x+0.10(20-x)-(20(0.035)=0
We add all the numbers together, and all the variables
0.02x+0.10(-1x+20)-(20(0.035)=0
We add all the numbers together, and all the variables
0.02x+0.10(-1x+20)=0
We multiply parentheses
0.02x-0.1x+2=0
We add all the numbers together, and all the variables
-0.08x+2=0
We move all terms containing x to the left, all other terms to the right
-0.08x=-2
x=-2/-0.08
x=+25
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