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6(3.5x+3+5)(1.6x+1.8)=85x
We move all terms to the left:
6(3.5x+3+5)(1.6x+1.8)-(85x)=0
We add all the numbers together, and all the variables
6(3.5x+8)(1.6x+1.8)-85x=0
We add all the numbers together, and all the variables
-85x+6(3.5x+8)(1.6x+1.8)=0
We multiply parentheses ..
6(+3x^2+5.4x+8x+14.4)-85x=0
We multiply parentheses
18x^2+30x+48x-85x+86.4=0
We add all the numbers together, and all the variables
18x^2-7x+86.4=0
a = 18; b = -7; c = +86.4;
Δ = b2-4ac
Δ = -72-4·18·86.4
Δ = -6171.8
Delta is less than zero, so there is no solution for the equation
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