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x(0.10)(1)+(150000-x)(0.8)(1)=13700
We move all terms to the left:
x(0.10)(1)+(150000-x)(0.8)(1)-(13700)=0
We add all the numbers together, and all the variables
x(0.1)1+(-1x+150000)(0.8)1-13700=0
We multiply parentheses
0.1x+(-1x+150000)(0.8)1-13700=0
We multiply parentheses ..
0.1x+(-0.8x+120000)1-13700=0
We move all terms containing x to the left, all other terms to the right
0.1x+(-0.8x+120000)1=13700
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