0.4(5x-15)=2.5x(x+3)

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Solution for 0.4(5x-15)=2.5x(x+3) equation: 



0.4(5x-15)=2.5x(x+3)

We move all terms to the left:

0.4(5x-15)-(2.5x(x+3))=0

We multiply parentheses

2x-(2.5x(x+3))-6=0



We calculate terms in parentheses: -(2.5x(x+3)), so:

2.5x(x+3)

We multiply parentheses

2x^2+6x

Back to the equation:

-(2x^2+6x)



We get rid of parentheses

-2x^2+2x-6x-6=0

We add all the numbers together, and all the variables

-2x^2-4x-6=0

a = -2; b = -4; c = -6;
Δ = b2-4ac
Δ = -42-4·(-2)·(-6)
Δ = -32
Delta is less than zero, so there is no solution for the equation

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