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4.2x=-12.6
We move all terms to the left:
4.2x-(-12.6)=0
We add all the numbers together, and all the variables
4.2x+12.6=0
We move all terms containing x to the left, all other terms to the right
4.2x=-12.6
x=-12.6/4.2
x=-3+-1.7763568394003E-15/4.2
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