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Simplifying 21 = 7(x + -2) Reorder the terms: 21 = 7(-2 + x) 21 = (-2 * 7 + x * 7) 21 = (-14 + 7x) Solving 21 = -14 + 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. 21 + -7x = -14 + 7x + -7x Combine like terms: 7x + -7x = 0 21 + -7x = -14 + 0 21 + -7x = -14 Add '-21' to each side of the equation. 21 + -21 + -7x = -14 + -21 Combine like terms: 21 + -21 = 0 0 + -7x = -14 + -21 -7x = -14 + -21 Combine like terms: -14 + -21 = -35 -7x = -35 Divide each side by '-7'. x = 5 Simplifying x = 5
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