4x+6=21/2x+12

Solution for 4x+6=21/2x+12 equation:

4x+6=21/2x+12

We move all terms to the left:

4x+6-(21/2x+12)=0


Domain of the equation: 2x+12)!=0

x∈R


We get rid of parentheses

4x-21/2x-12+6=0

We multiply all the terms by the denominator


4x*2x-12*2x+6*2x-21=0

Wy multiply elements

8x^2-24x+12x-21=0

We add all the numbers together, and all the variables

8x^2-12x-21=0

a = 8; b = -12; c = -21;
Δ = b2-4ac
Δ = -122-4·8·(-21)
Δ = 816
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

The end solution:

$\sqrt{\Delta}=\sqrt{816}=\sqrt{16*51}=\sqrt{16}*\sqrt{51}=4\sqrt{51}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-12)-4\sqrt{51}}{2*8}=\frac{12-4\sqrt{51}}{16}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-12)+4\sqrt{51}}{2*8}=\frac{12+4\sqrt{51}}{16}
$