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Simplifying 3(n + -7) + -4n = 12 Reorder the terms: 3(-7 + n) + -4n = 12 (-7 * 3 + n * 3) + -4n = 12 (-21 + 3n) + -4n = 12 Combine like terms: 3n + -4n = -1n -21 + -1n = 12 Solving -21 + -1n = 12 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + -1n = 12 + 21 Combine like terms: -21 + 21 = 0 0 + -1n = 12 + 21 -1n = 12 + 21 Combine like terms: 12 + 21 = 33 -1n = 33 Divide each side by '-1'. n = -33 Simplifying n = -33
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