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0.04x+0.07(15.000-x)=900
We move all terms to the left:
0.04x+0.07(15.000-x)-(900)=0
We add all the numbers together, and all the variables
0.04x+0.07(-1x+15)-900=0
We multiply parentheses
0.04x-0.07x+1.05-900=0
We add all the numbers together, and all the variables
-0.03x-898.95=0
We move all terms containing x to the left, all other terms to the right
-0.03x=898.95
x=898.95/-0.03
x=-29965+1.1368683772162E-13/0.03
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