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Simplifying 66 + -2x = 7x + 21 Reorder the terms: 66 + -2x = 21 + 7x Solving 66 + -2x = 21 + 7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7x' to each side of the equation. 66 + -2x + -7x = 21 + 7x + -7x Combine like terms: -2x + -7x = -9x 66 + -9x = 21 + 7x + -7x Combine like terms: 7x + -7x = 0 66 + -9x = 21 + 0 66 + -9x = 21 Add '-66' to each side of the equation. 66 + -66 + -9x = 21 + -66 Combine like terms: 66 + -66 = 0 0 + -9x = 21 + -66 -9x = 21 + -66 Combine like terms: 21 + -66 = -45 -9x = -45 Divide each side by '-9'. x = 5 Simplifying x = 5
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