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x+(x*1.05)+(x*1.05*1.18)=665.58
We move all terms to the left:
x+(x*1.05)+(x*1.05*1.18)-(665.58)=0
We add all the numbers together, and all the variables
x+(+x*1.05)+(+x*1.05*1.18)-(665.58)=0
We add all the numbers together, and all the variables
x+(+x*1.05)+(+x*1.05*1.18)-665.58=0
We get rid of parentheses
x+x*1.05+x*1.05*1.18-665.58=0
Wy multiply elements
x+1.05x+1.239x-665.58=0
We add all the numbers together, and all the variables
3.289x-665.58=0
We move all terms containing x to the left, all other terms to the right
3.289x=665.58
x=665.58/3.289
x=202+1/2.7362728785358
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