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Simplifying (7x + 21) + -1(12x + 36) = -4 Reorder the terms: (21 + 7x) + -1(12x + 36) = -4 Remove parenthesis around (21 + 7x) 21 + 7x + -1(12x + 36) = -4 Reorder the terms: 21 + 7x + -1(36 + 12x) = -4 21 + 7x + (36 * -1 + 12x * -1) = -4 21 + 7x + (-36 + -12x) = -4 Reorder the terms: 21 + -36 + 7x + -12x = -4 Combine like terms: 21 + -36 = -15 -15 + 7x + -12x = -4 Combine like terms: 7x + -12x = -5x -15 + -5x = -4 Solving -15 + -5x = -4 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '15' to each side of the equation. -15 + 15 + -5x = -4 + 15 Combine like terms: -15 + 15 = 0 0 + -5x = -4 + 15 -5x = -4 + 15 Combine like terms: -4 + 15 = 11 -5x = 11 Divide each side by '-5'. x = -2.2 Simplifying x = -2.2
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