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Simplifying 3x + 66 = 9x + 21 Reorder the terms: 66 + 3x = 9x + 21 Reorder the terms: 66 + 3x = 21 + 9x Solving 66 + 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. 66 + 3x + -9x = 21 + 9x + -9x Combine like terms: 3x + -9x = -6x 66 + -6x = 21 + 9x + -9x Combine like terms: 9x + -9x = 0 66 + -6x = 21 + 0 66 + -6x = 21 Add '-66' to each side of the equation. 66 + -66 + -6x = 21 + -66 Combine like terms: 66 + -66 = 0 0 + -6x = 21 + -66 -6x = 21 + -66 Combine like terms: 21 + -66 = -45 -6x = -45 Divide each side by '-6'. x = 7.5 Simplifying x = 7.5
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