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Simplifying 21 = (x + 3) * 2 Reorder the terms: 21 = (3 + x) * 2 Reorder the terms for easier multiplication: 21 = 2(3 + x) 21 = (3 * 2 + x * 2) 21 = (6 + 2x) Solving 21 = 6 + 2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2x' to each side of the equation. 21 + -2x = 6 + 2x + -2x Combine like terms: 2x + -2x = 0 21 + -2x = 6 + 0 21 + -2x = 6 Add '-21' to each side of the equation. 21 + -21 + -2x = 6 + -21 Combine like terms: 21 + -21 = 0 0 + -2x = 6 + -21 -2x = 6 + -21 Combine like terms: 6 + -21 = -15 -2x = -15 Divide each side by '-2'. x = 7.5 Simplifying x = 7.5
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