(12-3)(12-2)=(12+5)(2*12-3)+21

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Solution for (12-3)(12-2)=(12+5)(2*12-3)+21 equation: 


Simplifying
(12 + -3)(12 + -2) = (12 + 5)(2 * 12 + -3) + 21

Combine like terms: 12 + -3 = 9
(9)(12 + -2) = (12 + 5)(2 * 12 + -3) + 21

Combine like terms: 12 + -2 = 10
9(10) = (12 + 5)(2 * 12 + -3) + 21

Multiply 9 * 10
90 = (12 + 5)(2 * 12 + -3) + 21

Combine like terms: 12 + 5 = 17
90 = (17)(2 * 12 + -3) + 21

Multiply 2 * 12
90 = 17(24 + -3) + 21

Combine like terms: 24 + -3 = 21
90 = 17(21) + 21

Multiply 17 * 21
90 = 357 + 21

Combine like terms: 357 + 21 = 378
90 = 378

Solving
90 = 378

Couldn't find a variable to solve for.

This equation is invalid, the left and right sides are not equal, therefore there is no solution.

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