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0.04x+0.07(7000-x)=350
We move all terms to the left:
0.04x+0.07(7000-x)-(350)=0
We add all the numbers together, and all the variables
0.04x+0.07(-1x+7000)-350=0
We multiply parentheses
0.04x-0.07x+490-350=0
We add all the numbers together, and all the variables
-0.03x+140=0
We move all terms containing x to the left, all other terms to the right
-0.03x=-140
x=-140/-0.03
x=4666+0.02000000000001/0.03
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