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4.2x=-25.2
We move all terms to the left:
4.2x-(-25.2)=0
We add all the numbers together, and all the variables
4.2x+25.2=0
We move all terms containing x to the left, all other terms to the right
4.2x=-25.2
x=-25.2/4.2
x=-6+-3.5527136788005E-15/4.2
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