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0.09x+0.13(300+x)=61
We move all terms to the left:
0.09x+0.13(300+x)-(61)=0
We add all the numbers together, and all the variables
0.09x+0.13(x+300)-61=0
We multiply parentheses
0.09x+0.13x+39-61=0
We add all the numbers together, and all the variables
0.22x-22=0
We move all terms containing x to the left, all other terms to the right
0.22x=22
x=22/0.22
x=100
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