8x-(x-21)=7(x+3)

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Solution for 8x-(x-21)=7(x+3) equation: 


Simplifying
8x + -1(x + -21) = 7(x + 3)

Reorder the terms:
8x + -1(-21 + x) = 7(x + 3)
8x + (-21 * -1 + x * -1) = 7(x + 3)
8x + (21 + -1x) = 7(x + 3)

Reorder the terms:
21 + 8x + -1x = 7(x + 3)

Combine like terms: 8x + -1x = 7x
21 + 7x = 7(x + 3)

Reorder the terms:
21 + 7x = 7(3 + x)
21 + 7x = (3 * 7 + x * 7)
21 + 7x = (21 + 7x)

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

Combine like terms: 21 + -21 = 0
0 + 7x = 21 + -21 + 7x
7x = 21 + -21 + 7x

Combine like terms: 21 + -21 = 0
7x = 0 + 7x
7x = 7x

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

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

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

Solving
0 = 0

Couldn't find a variable to solve for.

This equation is an identity, all real numbers are solutions.

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