21x-1=4(5x+2)-7

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Solution for 21x-1=4(5x+2)-7 equation:


Simplifying
21x + -1 = 4(5x + 2) + -7

Reorder the terms:
-1 + 21x = 4(5x + 2) + -7

Reorder the terms:
-1 + 21x = 4(2 + 5x) + -7
-1 + 21x = (2 * 4 + 5x * 4) + -7
-1 + 21x = (8 + 20x) + -7

Reorder the terms:
-1 + 21x = 8 + -7 + 20x

Combine like terms: 8 + -7 = 1
-1 + 21x = 1 + 20x

Solving
-1 + 21x = 1 + 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.
-1 + 21x + -20x = 1 + 20x + -20x

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

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

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

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

Combine like terms: 1 + 1 = 2
1x = 2

Divide each side by '1'.
x = 2

Simplifying
x = 2

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