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5x-1.4x+12.4x=180
We move all terms to the left:
5x-1.4x+12.4x-(180)=0
We add all the numbers together, and all the variables
16x-180=0
We move all terms containing x to the left, all other terms to the right
16x=180
x=180/16
x=11+1/4
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