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Simplifying 5x + -15 = 7x + -21 Reorder the terms: -15 + 5x = 7x + -21 Reorder the terms: -15 + 5x = -21 + 7x Solving -15 + 5x = -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. -15 + 5x + -7x = -21 + 7x + -7x Combine like terms: 5x + -7x = -2x -15 + -2x = -21 + 7x + -7x Combine like terms: 7x + -7x = 0 -15 + -2x = -21 + 0 -15 + -2x = -21 Add '15' to each side of the equation. -15 + 15 + -2x = -21 + 15 Combine like terms: -15 + 15 = 0 0 + -2x = -21 + 15 -2x = -21 + 15 Combine like terms: -21 + 15 = -6 -2x = -6 Divide each side by '-2'. x = 3 Simplifying x = 3
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