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0.5(x+15)+0.4(x+25)=40
We move all terms to the left:
0.5(x+15)+0.4(x+25)-(40)=0
We multiply parentheses
0.5x+0.4x+7.5+10-40=0
We add all the numbers together, and all the variables
0.9x-22.5=0
We move all terms containing x to the left, all other terms to the right
0.9x=22.5
x=22.5/0.9
x=25
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