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(4x+1)(3x-7)-2x(6x+5=0
We multiply parentheses ..
(+12x^2-28x+3x-7)-2x(6x+5=0
We get rid of parentheses
12x^2-28x+3x-2x(6x+5-7=0
We add all the numbers together, and all the variables
12x^2-25x-2x(6x+5-7=0
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