3(7-5x-9x)+6(6x+3)=21

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Solution for 3(7-5x-9x)+6(6x+3)=21 equation:


Simplifying
3(7 + -5x + -9x) + 6(6x + 3) = 21

Combine like terms: -5x + -9x = -14x
3(7 + -14x) + 6(6x + 3) = 21
(7 * 3 + -14x * 3) + 6(6x + 3) = 21
(21 + -42x) + 6(6x + 3) = 21

Reorder the terms:
21 + -42x + 6(3 + 6x) = 21
21 + -42x + (3 * 6 + 6x * 6) = 21
21 + -42x + (18 + 36x) = 21

Reorder the terms:
21 + 18 + -42x + 36x = 21

Combine like terms: 21 + 18 = 39
39 + -42x + 36x = 21

Combine like terms: -42x + 36x = -6x
39 + -6x = 21

Solving
39 + -6x = 21

Solving for variable 'x'.

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

Add '-39' to each side of the equation.
39 + -39 + -6x = 21 + -39

Combine like terms: 39 + -39 = 0
0 + -6x = 21 + -39
-6x = 21 + -39

Combine like terms: 21 + -39 = -18
-6x = -18

Divide each side by '-6'.
x = 3

Simplifying
x = 3

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