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Simplifying 21 = 7(x + -6) Reorder the terms: 21 = 7(-6 + x) 21 = (-6 * 7 + x * 7) 21 = (-42 + 7x) Solving 21 = -42 + 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 = -42 + 7x + -7x Combine like terms: 7x + -7x = 0 21 + -7x = -42 + 0 21 + -7x = -42 Add '-21' to each side of the equation. 21 + -21 + -7x = -42 + -21 Combine like terms: 21 + -21 = 0 0 + -7x = -42 + -21 -7x = -42 + -21 Combine like terms: -42 + -21 = -63 -7x = -63 Divide each side by '-7'. x = 9 Simplifying x = 9
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