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Simplifying 7x + -15 = 3(3x + 9) Reorder the terms: -15 + 7x = 3(3x + 9) Reorder the terms: -15 + 7x = 3(9 + 3x) -15 + 7x = (9 * 3 + 3x * 3) -15 + 7x = (27 + 9x) Solving -15 + 7x = 27 + 9x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9x' to each side of the equation. -15 + 7x + -9x = 27 + 9x + -9x Combine like terms: 7x + -9x = -2x -15 + -2x = 27 + 9x + -9x Combine like terms: 9x + -9x = 0 -15 + -2x = 27 + 0 -15 + -2x = 27 Add '15' to each side of the equation. -15 + 15 + -2x = 27 + 15 Combine like terms: -15 + 15 = 0 0 + -2x = 27 + 15 -2x = 27 + 15 Combine like terms: 27 + 15 = 42 -2x = 42 Divide each side by '-2'. x = -21 Simplifying x = -21
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