2((1)+5)+9=21-5((1)-1)

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Solution for 2((1)+5)+9=21-5((1)-1) equation: 


Simplifying
2((1) + 5) + 9 = 21 + -5((1) + -1)
2(1 + 5) + 9 = 21 + -5((1) + -1)

Combine like terms: 1 + 5 = 6
2(6) + 9 = 21 + -5((1) + -1)

Multiply 2 * 6
12 + 9 = 21 + -5((1) + -1)

Combine like terms: 12 + 9 = 21
21 = 21 + -5((1) + -1)
21 = 21 + -5(1 + -1)

Combine like terms: 1 + -1 = 0
21 = 21 + -5(0)

Multiply -5 * 0
21 = 21 + 0

Anything times zero is zero.
21 = 21 + 0

Combine like terms: 21 + 0 = 21
21 = 21

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

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

Combine like terms: 21 + -21 = 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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