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12x+1.2=-10.2
We move all terms to the left:
12x+1.2-(-10.2)=0
We add all the numbers together, and all the variables
12x+11.4=0
We move all terms containing x to the left, all other terms to the right
12x=-11.4
x=-11.4/12
x=-8.1428571428571/8.5714285714286
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