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(0.1x+54)+(0.3x+44)=180
We move all terms to the left:
(0.1x+54)+(0.3x+44)-(180)=0
We get rid of parentheses
0.1x+0.3x+54+44-180=0
We add all the numbers together, and all the variables
0.4x-82=0
We move all terms containing x to the left, all other terms to the right
0.4x=82
x=82/0.4
x=205
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