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Simplifying -8x + -39 = 7x + 21 Reorder the terms: -39 + -8x = 7x + 21 Reorder the terms: -39 + -8x = 21 + 7x Solving -39 + -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. -39 + -8x + -7x = 21 + 7x + -7x Combine like terms: -8x + -7x = -15x -39 + -15x = 21 + 7x + -7x Combine like terms: 7x + -7x = 0 -39 + -15x = 21 + 0 -39 + -15x = 21 Add '39' to each side of the equation. -39 + 39 + -15x = 21 + 39 Combine like terms: -39 + 39 = 0 0 + -15x = 21 + 39 -15x = 21 + 39 Combine like terms: 21 + 39 = 60 -15x = 60 Divide each side by '-15'. x = -4 Simplifying x = -4
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