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0.25(x+50)-0.03(x-40)=15.9
We move all terms to the left:
0.25(x+50)-0.03(x-40)-(15.9)=0
We add all the numbers together, and all the variables
0.25(x+50)-0.03(x-40)-15.9=0
We multiply parentheses
0.25x-0.03x+12.5+1.2-15.9=0
We add all the numbers together, and all the variables
0.22x-2.2=0
We move all terms containing x to the left, all other terms to the right
0.22x=2.2
x=2.2/0.22
x=10
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