If it's not what You are looking for type in the equation solver your own equation and let us solve it.
2x+3x+4x+6x+7x^2=78
We move all terms to the left:
2x+3x+4x+6x+7x^2-(78)=0
We add all the numbers together, and all the variables
7x^2+15x-78=0
a = 7; b = 15; c = -78;
Δ = b2-4ac
Δ = 152-4·7·(-78)
Δ = 2409
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(15)-\sqrt{2409}}{2*7}=\frac{-15-\sqrt{2409}}{14} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(15)+\sqrt{2409}}{2*7}=\frac{-15+\sqrt{2409}}{14} $
| 18+x·4-7=19 | | 5x+12-3x-19=-4 | | 18+x·4-7=19 | | x2-13x=30 | | -9y+30=-6(y-4) | | (p+6)*p=56 | | -15-6x=-6x-13 | | 3a+3a+5a+3a+3a+9+3=204 | | -22=3x+4(x-2) | | -2(2x-6)=9x+8 | | -3(-7x+4)=4x | | x2+x=20 | | p=56/p+6 | | x=4=2x=2 | | 1.001041667^12t=1.5 | | -3x-8+5x=-4x+4 | | 2x2-6x-20=0 | | z/10-6=3 | | 9(3x-5)-3x=-6x | | 2m^2+40m+100=0 | | -7y+4(y+4)=-2 | | -5x-2=-6x-8 | | 10a-8=40 | | 10a-80=40 | | 5s+16=151 | | x/9+7=-6 | | 2(-5x+8)=-8 | | a/4+3=12 | | x2−10x+41=0 | | -8+4(-6x+8)=-3 | | 2x+3x+4x+6x+7x=78 | | a÷4+3=12 |