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Simplifying -28 = 7(x + -7) Reorder the terms: -28 = 7(-7 + x) -28 = (-7 * 7 + x * 7) -28 = (-49 + 7x) Solving -28 = -49 + 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. -28 + -7x = -49 + 7x + -7x Combine like terms: 7x + -7x = 0 -28 + -7x = -49 + 0 -28 + -7x = -49 Add '28' to each side of the equation. -28 + 28 + -7x = -49 + 28 Combine like terms: -28 + 28 = 0 0 + -7x = -49 + 28 -7x = -49 + 28 Combine like terms: -49 + 28 = -21 -7x = -21 Divide each side by '-7'. x = 3 Simplifying x = 3
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