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Simplifying 15 + -1x = 21(x + 3) Reorder the terms: 15 + -1x = 21(3 + x) 15 + -1x = (3 * 21 + x * 21) 15 + -1x = (63 + 21x) Solving 15 + -1x = 63 + 21x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21x' to each side of the equation. 15 + -1x + -21x = 63 + 21x + -21x Combine like terms: -1x + -21x = -22x 15 + -22x = 63 + 21x + -21x Combine like terms: 21x + -21x = 0 15 + -22x = 63 + 0 15 + -22x = 63 Add '-15' to each side of the equation. 15 + -15 + -22x = 63 + -15 Combine like terms: 15 + -15 = 0 0 + -22x = 63 + -15 -22x = 63 + -15 Combine like terms: 63 + -15 = 48 -22x = 48 Divide each side by '-22'. x = -2.181818182 Simplifying x = -2.181818182
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