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