3/4a+7=a-1

Solution for 3/4a+7=a-1 equation:

3/4a+7=a-1

We move all terms to the left:

3/4a+7-(a-1)=0


Domain of the equation: 4a!=0

a!=0/4

a!=0

a∈R


We get rid of parentheses

3/4a-a+1+7=0

We multiply all the terms by the denominator


-a*4a+1*4a+7*4a+3=0

Wy multiply elements

-4a^2+4a+28a+3=0

We add all the numbers together, and all the variables

-4a^2+32a+3=0

a = -4; b = 32; c = +3;
Δ = b2-4ac
Δ = 322-4·(-4)·3
Δ = 1072
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$a_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$a_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

The end solution:

$\sqrt{\Delta}=\sqrt{1072}=\sqrt{16*67}=\sqrt{16}*\sqrt{67}=4\sqrt{67}$
$a_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(32)-4\sqrt{67}}{2*-4}=\frac{-32-4\sqrt{67}}{-8}
$
$a_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(32)+4\sqrt{67}}{2*-4}=\frac{-32+4\sqrt{67}}{-8}
$