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Simplifying 63 + -3x = 9x + 21 Reorder the terms: 63 + -3x = 21 + 9x Solving 63 + -3x = 21 + 9x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9x' to each side of the equation. 63 + -3x + -9x = 21 + 9x + -9x Combine like terms: -3x + -9x = -12x 63 + -12x = 21 + 9x + -9x Combine like terms: 9x + -9x = 0 63 + -12x = 21 + 0 63 + -12x = 21 Add '-63' to each side of the equation. 63 + -63 + -12x = 21 + -63 Combine like terms: 63 + -63 = 0 0 + -12x = 21 + -63 -12x = 21 + -63 Combine like terms: 21 + -63 = -42 -12x = -42 Divide each side by '-12'. x = 3.5 Simplifying x = 3.5
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