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0.90x+0.05(20-x)=0.10(129)
We move all terms to the left:
0.90x+0.05(20-x)-(0.10(129))=0
We add all the numbers together, and all the variables
0.90x+0.05(-1x+20)-(0.10129)=0
We add all the numbers together, and all the variables
0.90x+0.05(-1x+20)-0.10129=0
We multiply parentheses
0.90x-0.05x+1-0.10129=0
We add all the numbers together, and all the variables
0.85x+0.89871=0
We move all terms containing x to the left, all other terms to the right
0.85x=-0.89871
x=-0.89871/0.85
x=-1+0.04871/0.85
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