7+3(-1+1)=2*-1+9

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Solution for 7+3(-1+1)=2*-1+9 equation: 


Simplifying
7 + 3(-1 + 1) = 2 * -1 + 9

Combine like terms: -1 + 1 = 0
7 + 3(0) = 2 * -1 + 9

Multiply 3 * 0
7 + 0 = 2 * -1 + 9

Anything times zero is zero.
7 + 0 = 2 * -1 + 9

Combine like terms: 7 + 0 = 7
7 = 2 * -1 + 9

Multiply 2 * -1
7 = -2 + 9

Combine like terms: -2 + 9 = 7
7 = 7

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

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

Combine like terms: 7 + -7 = 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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