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(x*40)+(x*1.5*10)=550
We move all terms to the left:
(x*40)+(x*1.5*10)-(550)=0
We add all the numbers together, and all the variables
(+x*40)+(+x*1.5*10)-550=0
We get rid of parentheses
x*40+x*1.5*10-550=0
Wy multiply elements
40x+15x-550=0
We add all the numbers together, and all the variables
55x-550=0
We move all terms containing x to the left, all other terms to the right
55x=550
x=550/55
x=10
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