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0.2(x+40)-0.06(x-50)=15.2
We move all terms to the left:
0.2(x+40)-0.06(x-50)-(15.2)=0
We add all the numbers together, and all the variables
0.2(x+40)-0.06(x-50)-15.2=0
We multiply parentheses
0.2x-0.06x+8+3-15.2=0
We add all the numbers together, and all the variables
0.14x-4.2=0
We move all terms containing x to the left, all other terms to the right
0.14x=4.2
x=4.2/0.14
x=30
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