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.25x+0.20(240-x)=51.5
We move all terms to the left:
.25x+0.20(240-x)-(51.5)=0
We add all the numbers together, and all the variables
.25x+0.20(-1x+240)-(51.5)=0
We add all the numbers together, and all the variables
.25x+0.20(-1x+240)-51.5=0
We multiply parentheses
.25x-0.2x+48-51.5=0
We add all the numbers together, and all the variables
0.05x-3.5=0
We move all terms containing x to the left, all other terms to the right
0.05x=3.5
x=3.5/0.05
x=70
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