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1.x+1.2x-5.4=-10
We move all terms to the left:
1.x+1.2x-5.4-(-10)=0
We add all the numbers together, and all the variables
2.2x+4.6=0
We move all terms containing x to the left, all other terms to the right
2.2x=-4.6
x=-4.6/2.2
x=-2+0.2/2.2
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