3x-x(x-1)=7

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Solution for 3x-x(x-1)=7 equation: 



3x-x(x-1)=7

We move all terms to the left:

3x-x(x-1)-(7)=0

We multiply parentheses

-x^2+3x+1x-7=0

We add all the numbers together, and all the variables

-1x^2+4x-7=0

a = -1; b = 4; c = -7;
Δ = b2-4ac
Δ = 42-4·(-1)·(-7)
Δ = -12
Delta is less than zero, so there is no solution for the equation

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