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8.4(6+2x)=0
We add all the numbers together, and all the variables
8.4(2x+6)=0
We multiply parentheses
16.8x+50.4=0
We move all terms containing x to the left, all other terms to the right
16.8x=-50.4
x=-50.4/16.8
x=-3+-7.105427357601E-15/16.8
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