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Simplifying 7(m + -9) + -3(15m + -4) = 21 Reorder the terms: 7(-9 + m) + -3(15m + -4) = 21 (-9 * 7 + m * 7) + -3(15m + -4) = 21 (-63 + 7m) + -3(15m + -4) = 21 Reorder the terms: -63 + 7m + -3(-4 + 15m) = 21 -63 + 7m + (-4 * -3 + 15m * -3) = 21 -63 + 7m + (12 + -45m) = 21 Reorder the terms: -63 + 12 + 7m + -45m = 21 Combine like terms: -63 + 12 = -51 -51 + 7m + -45m = 21 Combine like terms: 7m + -45m = -38m -51 + -38m = 21 Solving -51 + -38m = 21 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '51' to each side of the equation. -51 + 51 + -38m = 21 + 51 Combine like terms: -51 + 51 = 0 0 + -38m = 21 + 51 -38m = 21 + 51 Combine like terms: 21 + 51 = 72 -38m = 72 Divide each side by '-38'. m = -1.894736842 Simplifying m = -1.894736842
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