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

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


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

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

Remove parenthesis around (4 + x)
21 = 4 + x + (2x + -7)

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

Remove parenthesis around (-7 + 2x)
21 = 4 + x + -7 + 2x

Reorder the terms:
21 = 4 + -7 + x + 2x

Combine like terms: 4 + -7 = -3
21 = -3 + x + 2x

Combine like terms: x + 2x = 3x
21 = -3 + 3x

Solving
21 = -3 + 3x

Solving for variable 'x'.

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

Add '-3x' to each side of the equation.
21 + -3x = -3 + 3x + -3x

Combine like terms: 3x + -3x = 0
21 + -3x = -3 + 0
21 + -3x = -3

Add '-21' to each side of the equation.
21 + -21 + -3x = -3 + -21

Combine like terms: 21 + -21 = 0
0 + -3x = -3 + -21
-3x = -3 + -21

Combine like terms: -3 + -21 = -24
-3x = -24

Divide each side by '-3'.
x = 8

Simplifying
x = 8

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