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Simplifying 21 = 7(x + -4) Reorder the terms: 21 = 7(-4 + x) 21 = (-4 * 7 + x * 7) 21 = (-28 + 7x) Solving 21 = -28 + 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 = -28 + 7x + -7x Combine like terms: 7x + -7x = 0 21 + -7x = -28 + 0 21 + -7x = -28 Add '-21' to each side of the equation. 21 + -21 + -7x = -28 + -21 Combine like terms: 21 + -21 = 0 0 + -7x = -28 + -21 -7x = -28 + -21 Combine like terms: -28 + -21 = -49 -7x = -49 Divide each side by '-7'. x = 7 Simplifying x = 7
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