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0.04x+0.07(13000+x)=780
We move all terms to the left:
0.04x+0.07(13000+x)-(780)=0
We add all the numbers together, and all the variables
0.04x+0.07(x+13000)-780=0
We multiply parentheses
0.04x+0.07x+910-780=0
We add all the numbers together, and all the variables
0.11x+130=0
We move all terms containing x to the left, all other terms to the right
0.11x=-130
x=-130/0.11
x=-1181+0.090000000000003/0.11
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