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12.4x(-6.3)=-78.12
We move all terms to the left:
12.4x(-6.3)-(-78.12)=0
We add all the numbers together, and all the variables
12.4x(-6.3)+78.12=0
We multiply parentheses
-75.6x+78.12=0
We move all terms containing x to the left, all other terms to the right
-75.6x=-78.12
x=-78.12/-75.6
x=1+2.52/75.6
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