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Simplifying 3x + 15 = 7x + -21 Reorder the terms: 15 + 3x = 7x + -21 Reorder the terms: 15 + 3x = -21 + 7x Solving 15 + 3x = -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 + 3x + -7x = -21 + 7x + -7x Combine like terms: 3x + -7x = -4x 15 + -4x = -21 + 7x + -7x Combine like terms: 7x + -7x = 0 15 + -4x = -21 + 0 15 + -4x = -21 Add '-15' to each side of the equation. 15 + -15 + -4x = -21 + -15 Combine like terms: 15 + -15 = 0 0 + -4x = -21 + -15 -4x = -21 + -15 Combine like terms: -21 + -15 = -36 -4x = -36 Divide each side by '-4'. x = 9 Simplifying x = 9
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