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0.45x+0.05(12-x)=0.10(-42)
We move all terms to the left:
0.45x+0.05(12-x)-(0.10(-42))=0
We add all the numbers together, and all the variables
0.45x+0.05(-1x+12)-(0.10(-42))=0
We add all the numbers together, and all the variables
0.45x+0.05(-1x+12)+4.2=0
We multiply parentheses
0.45x-0.05x+0.6+4.2=0
We add all the numbers together, and all the variables
0.4x+4.8=0
We move all terms containing x to the left, all other terms to the right
0.4x=-4.8
x=-4.8/0.4
x=-11+0.4/0.4
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