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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 = -42 -7x = -42 Divide each side by '-7'. x = 6 Simplifying x = 6
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