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0.8(x+40)+.02x=57
We move all terms to the left:
0.8(x+40)+.02x-(57)=0
We add all the numbers together, and all the variables
.02x+0.8(x+40)-57=0
We multiply parentheses
.02x+0.8x+32-57=0
We add all the numbers together, and all the variables
0.82x-25=0
We move all terms containing x to the left, all other terms to the right
0.82x=25
x=25/0.82
x=30+0.4/0.82
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