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0.04x+0.07(13.000.00-x)=780.00
We move all terms to the left:
0.04x+0.07(13.000.00-x)-(780.00)=0
We add all the numbers together, and all the variables
0.04x+0.07(-1x)-780=0
We multiply parentheses
0.04x-0.07x-780=0
We add all the numbers together, and all the variables
-0.03x-780=0
We move all terms containing x to the left, all other terms to the right
-0.03x=780
x=780/-0.03
x=-26000
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