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0.90x+0.05(4-x)=0.10(87)
We move all terms to the left:
0.90x+0.05(4-x)-(0.10(87))=0
We add all the numbers together, and all the variables
0.90x+0.05(-1x+4)-(0.1087)=0
We add all the numbers together, and all the variables
0.90x+0.05(-1x+4)-0.1087=0
We multiply parentheses
0.90x-0.05x+0.2-0.1087=0
We add all the numbers together, and all the variables
0.85x+0.0913=0
We move all terms containing x to the left, all other terms to the right
0.85x=-0.0913
x=-0.0913/0.85
x=-0.0913/0.85
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