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1.1x+1.2x+(-5.4)=(-10)
We move all terms to the left:
1.1x+1.2x+(-5.4)-((-10))=0
We add all the numbers together, and all the variables
2.3x+4.6=0
We move all terms containing x to the left, all other terms to the right
2.3x=-4.6
x=-4.6/2.3
x=-2
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