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2.4x+8.1x=-30.5
We move all terms to the left:
2.4x+8.1x-(-30.5)=0
We add all the numbers together, and all the variables
10.5x+30.5=0
We move all terms containing x to the left, all other terms to the right
10.5x=-30.5
x=-30.5/10.5
x=-2+6.33333333333/7
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