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0.25x+0.05(12-x)=0.10(42)
We move all terms to the left:
0.25x+0.05(12-x)-(0.10(42))=0
We add all the numbers together, and all the variables
0.25x+0.05(-1x+12)-(0.1042)=0
We add all the numbers together, and all the variables
0.25x+0.05(-1x+12)-0.1042=0
We multiply parentheses
0.25x-0.05x+0.6-0.1042=0
We add all the numbers together, and all the variables
0.2x+0.4958=0
We move all terms containing x to the left, all other terms to the right
0.2x=-0.4958
x=-0.4958/0.2
x=-2+0.0958/0.2
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