21x-7=4(5x+4)-9

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Solution for 21x-7=4(5x+4)-9 equation:


Simplifying
21x + -7 = 4(5x + 4) + -9

Reorder the terms:
-7 + 21x = 4(5x + 4) + -9

Reorder the terms:
-7 + 21x = 4(4 + 5x) + -9
-7 + 21x = (4 * 4 + 5x * 4) + -9
-7 + 21x = (16 + 20x) + -9

Reorder the terms:
-7 + 21x = 16 + -9 + 20x

Combine like terms: 16 + -9 = 7
-7 + 21x = 7 + 20x

Solving
-7 + 21x = 7 + 20x

Solving for variable 'x'.

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

Add '-20x' to each side of the equation.
-7 + 21x + -20x = 7 + 20x + -20x

Combine like terms: 21x + -20x = 1x
-7 + 1x = 7 + 20x + -20x

Combine like terms: 20x + -20x = 0
-7 + 1x = 7 + 0
-7 + 1x = 7

Add '7' to each side of the equation.
-7 + 7 + 1x = 7 + 7

Combine like terms: -7 + 7 = 0
0 + 1x = 7 + 7
1x = 7 + 7

Combine like terms: 7 + 7 = 14
1x = 14

Divide each side by '1'.
x = 14

Simplifying
x = 14

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