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Simplifying 66 + -6x = 9x + 21 Reorder the terms: 66 + -6x = 21 + 9x Solving 66 + -6x = 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 + -6x + -9x = 21 + 9x + -9x Combine like terms: -6x + -9x = -15x 66 + -15x = 21 + 9x + -9x Combine like terms: 9x + -9x = 0 66 + -15x = 21 + 0 66 + -15x = 21 Add '-66' to each side of the equation. 66 + -66 + -15x = 21 + -66 Combine like terms: 66 + -66 = 0 0 + -15x = 21 + -66 -15x = 21 + -66 Combine like terms: 21 + -66 = -45 -15x = -45 Divide each side by '-15'. x = 3 Simplifying x = 3
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