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5(9-8x)=-7x(6x+5)+4
We move all terms to the left:
5(9-8x)-(-7x(6x+5)+4)=0
We add all the numbers together, and all the variables
5(-8x+9)-(-7x(6x+5)+4)=0
We multiply parentheses
-40x-(-7x(6x+5)+4)+45=0
We calculate terms in parentheses: -(-7x(6x+5)+4), so:We get rid of parentheses
-7x(6x+5)+4
We multiply parentheses
-42x^2-35x+4
Back to the equation:
-(-42x^2-35x+4)
42x^2+35x-40x-4+45=0
We add all the numbers together, and all the variables
42x^2-5x+41=0
a = 42; b = -5; c = +41;
Δ = b2-4ac
Δ = -52-4·42·41
Δ = -6863
Delta is less than zero, so there is no solution for the equation
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