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(2x+28)+(4x+45.5)=90
We move all terms to the left:
(2x+28)+(4x+45.5)-(90)=0
We get rid of parentheses
2x+4x+28+45.5-90=0
We add all the numbers together, and all the variables
6x-16.5=0
We move all terms containing x to the left, all other terms to the right
6x=16.5
x=16.5/6
x=2+1.8/2.4
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