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.07x+.12(4x+21000)=32220
We move all terms to the left:
.07x+.12(4x+21000)-(32220)=0
We multiply parentheses
.07x+0.48x+2520-32220=0
We add all the numbers together, and all the variables
0.55x-29700=0
We move all terms containing x to the left, all other terms to the right
0.55x=29700
x=29700/0.55
x=53999+0.54999999999927/0.55
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