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Simplifying -69 = 6x + -3(-3x + -7) Reorder the terms: -69 = 6x + -3(-7 + -3x) -69 = 6x + (-7 * -3 + -3x * -3) -69 = 6x + (21 + 9x) Reorder the terms: -69 = 21 + 6x + 9x Combine like terms: 6x + 9x = 15x -69 = 21 + 15x Solving -69 = 21 + 15x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-15x' to each side of the equation. -69 + -15x = 21 + 15x + -15x Combine like terms: 15x + -15x = 0 -69 + -15x = 21 + 0 -69 + -15x = 21 Add '69' to each side of the equation. -69 + 69 + -15x = 21 + 69 Combine like terms: -69 + 69 = 0 0 + -15x = 21 + 69 -15x = 21 + 69 Combine like terms: 21 + 69 = 90 -15x = 90 Divide each side by '-15'. x = -6 Simplifying x = -6
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