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Simplifying 63 = -7(x + 3) Reorder the terms: 63 = -7(3 + x) 63 = (3 * -7 + x * -7) 63 = (-21 + -7x) Solving 63 = -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. 63 + 7x = -21 + -7x + 7x Combine like terms: -7x + 7x = 0 63 + 7x = -21 + 0 63 + 7x = -21 Add '-63' to each side of the equation. 63 + -63 + 7x = -21 + -63 Combine like terms: 63 + -63 = 0 0 + 7x = -21 + -63 7x = -21 + -63 Combine like terms: -21 + -63 = -84 7x = -84 Divide each side by '7'. x = -12 Simplifying x = -12
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