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7x+11.2x+2.4x-28=180
We move all terms to the left:
7x+11.2x+2.4x-28-(180)=0
We add all the numbers together, and all the variables
20.6x-208=0
We move all terms containing x to the left, all other terms to the right
20.6x=208
x=208/20.6
x=10+1/10.3
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