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Simplifying 21 * 3 = 2x Multiply 21 * 3 63 = 2x Solving 63 = 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. 63 + -2x = 2x + -2x Combine like terms: 2x + -2x = 0 63 + -2x = 0 Add '-63' to each side of the equation. 63 + -63 + -2x = 0 + -63 Combine like terms: 63 + -63 = 0 0 + -2x = 0 + -63 -2x = 0 + -63 Combine like terms: 0 + -63 = -63 -2x = -63 Divide each side by '-2'. x = 31.5 Simplifying x = 31.5
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