2(21)+3(21)-12=4(21)+9

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Solution for 2(21)+3(21)-12=4(21)+9 equation: 


Simplifying
2(21) + 3(21) + -12 = 4(21) + 9

Multiply 2 * 21
42 + 3(21) + -12 = 4(21) + 9

Multiply 3 * 21
42 + 63 + -12 = 4(21) + 9

Combine like terms: 42 + 63 = 105
105 + -12 = 4(21) + 9

Combine like terms: 105 + -12 = 93
93 = 4(21) + 9

Multiply 4 * 21
93 = 84 + 9

Combine like terms: 84 + 9 = 93
93 = 93

Add '-93' to each side of the equation.
93 + -93 = 93 + -93

Combine like terms: 93 + -93 = 0
0 = 93 + -93

Combine like terms: 93 + -93 = 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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