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(0.1x-28)+(0.3x-46)=180
We move all terms to the left:
(0.1x-28)+(0.3x-46)-(180)=0
We get rid of parentheses
0.1x+0.3x-28-46-180=0
We add all the numbers together, and all the variables
0.4x-254=0
We move all terms containing x to the left, all other terms to the right
0.4x=254
x=254/0.4
x=635
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