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2.8x+1.5x=-13.5
We move all terms to the left:
2.8x+1.5x-(-13.5)=0
We add all the numbers together, and all the variables
4.3x+13.5=0
We move all terms containing x to the left, all other terms to the right
4.3x=-13.5
x=-13.5/4.3
x=-3+0.6/4.3
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