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0.40x+0.05(12-x)=0.10(-1)
We move all terms to the left:
0.40x+0.05(12-x)-(0.10(-1))=0
We add all the numbers together, and all the variables
0.40x+0.05(-1x+12)-(0.10(-1))=0
We add all the numbers together, and all the variables
0.40x+0.05(-1x+12)+0.1=0
We multiply parentheses
0.40x-0.05x+0.6+0.1=0
We add all the numbers together, and all the variables
0.35x+0.7=0
We move all terms containing x to the left, all other terms to the right
0.35x=-0.7
x=-0.7/0.35
x=-2
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