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Simplifying -15 = -4(1x + 7) Reorder the terms: -15 = -4(7 + 1x) -15 = (7 * -4 + 1x * -4) -15 = (-28 + -4x) Solving -15 = -28 + -4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4x' to each side of the equation. -15 + 4x = -28 + -4x + 4x Combine like terms: -4x + 4x = 0 -15 + 4x = -28 + 0 -15 + 4x = -28 Add '15' to each side of the equation. -15 + 15 + 4x = -28 + 15 Combine like terms: -15 + 15 = 0 0 + 4x = -28 + 15 4x = -28 + 15 Combine like terms: -28 + 15 = -13 4x = -13 Divide each side by '4'. x = -3.25 Simplifying x = -3.25
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