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1.1x+1.2x-5.4=-42
We move all terms to the left:
1.1x+1.2x-5.4-(-42)=0
We add all the numbers together, and all the variables
2.3x+36.6=0
We move all terms containing x to the left, all other terms to the right
2.3x=-36.6
x=-36.6/2.3
x=-15+1/1.0952380952381
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