7x(5-3x)+-4+21x^2+-25x=12

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Solution for 7x(5-3x)+-4+21x^2+-25x=12 equation: 


Simplifying
7x(5 + -3x) + -4 + 21x2 + -25x = 12
(5 * 7x + -3x * 7x) + -4 + 21x2 + -25x = 12
(35x + -21x2) + -4 + 21x2 + -25x = 12

Reorder the terms:
-4 + 35x + -25x + -21x2 + 21x2 = 12

Combine like terms: 35x + -25x = 10x
-4 + 10x + -21x2 + 21x2 = 12

Combine like terms: -21x2 + 21x2 = 0
-4 + 10x + 0 = 12
-4 + 10x = 12

Solving
-4 + 10x = 12

Solving for variable 'x'.

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

Add '4' to each side of the equation.
-4 + 4 + 10x = 12 + 4

Combine like terms: -4 + 4 = 0
0 + 10x = 12 + 4
10x = 12 + 4

Combine like terms: 12 + 4 = 16
10x = 16

Divide each side by '10'.
x = 1.6

Simplifying
x = 1.6

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