21x-3=4(5x+4)-13

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Solution for 21x-3=4(5x+4)-13 equation:


Simplifying
21x + -3 = 4(5x + 4) + -13

Reorder the terms:
-3 + 21x = 4(5x + 4) + -13

Reorder the terms:
-3 + 21x = 4(4 + 5x) + -13
-3 + 21x = (4 * 4 + 5x * 4) + -13
-3 + 21x = (16 + 20x) + -13

Reorder the terms:
-3 + 21x = 16 + -13 + 20x

Combine like terms: 16 + -13 = 3
-3 + 21x = 3 + 20x

Solving
-3 + 21x = 3 + 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.
-3 + 21x + -20x = 3 + 20x + -20x

Combine like terms: 21x + -20x = 1x
-3 + 1x = 3 + 20x + -20x

Combine like terms: 20x + -20x = 0
-3 + 1x = 3 + 0
-3 + 1x = 3

Add '3' to each side of the equation.
-3 + 3 + 1x = 3 + 3

Combine like terms: -3 + 3 = 0
0 + 1x = 3 + 3
1x = 3 + 3

Combine like terms: 3 + 3 = 6
1x = 6

Divide each side by '1'.
x = 6

Simplifying
x = 6

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