(8x^2-7x-4)-(5x^2+1)=3x^2+12

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Solution for (8x^2-7x-4)-(5x^2+1)=3x^2+12 equation:


Simplifying
(8x2 + -7x + -4) + -1(5x2 + 1) = 3x2 + 12

Reorder the terms:
(-4 + -7x + 8x2) + -1(5x2 + 1) = 3x2 + 12

Remove parenthesis around (-4 + -7x + 8x2)
-4 + -7x + 8x2 + -1(5x2 + 1) = 3x2 + 12

Reorder the terms:
-4 + -7x + 8x2 + -1(1 + 5x2) = 3x2 + 12
-4 + -7x + 8x2 + (1 * -1 + 5x2 * -1) = 3x2 + 12
-4 + -7x + 8x2 + (-1 + -5x2) = 3x2 + 12

Reorder the terms:
-4 + -1 + -7x + 8x2 + -5x2 = 3x2 + 12

Combine like terms: -4 + -1 = -5
-5 + -7x + 8x2 + -5x2 = 3x2 + 12

Combine like terms: 8x2 + -5x2 = 3x2
-5 + -7x + 3x2 = 3x2 + 12

Reorder the terms:
-5 + -7x + 3x2 = 12 + 3x2

Add '-3x2' to each side of the equation.
-5 + -7x + 3x2 + -3x2 = 12 + 3x2 + -3x2

Combine like terms: 3x2 + -3x2 = 0
-5 + -7x + 0 = 12 + 3x2 + -3x2
-5 + -7x = 12 + 3x2 + -3x2

Combine like terms: 3x2 + -3x2 = 0
-5 + -7x = 12 + 0
-5 + -7x = 12

Solving
-5 + -7x = 12

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '5' to each side of the equation.
-5 + 5 + -7x = 12 + 5

Combine like terms: -5 + 5 = 0
0 + -7x = 12 + 5
-7x = 12 + 5

Combine like terms: 12 + 5 = 17
-7x = 17

Divide each side by '-7'.
x = -2.428571429

Simplifying
x = -2.428571429

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