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Simplifying -69 + -8x = 7x + 21 Reorder the terms: -69 + -8x = 21 + 7x Solving -69 + -8x = 21 + 7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7x' to each side of the equation. -69 + -8x + -7x = 21 + 7x + -7x Combine like terms: -8x + -7x = -15x -69 + -15x = 21 + 7x + -7x Combine like terms: 7x + -7x = 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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