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Simplifying 225 = -15(x + -6) Reorder the terms: 225 = -15(-6 + x) 225 = (-6 * -15 + x * -15) 225 = (90 + -15x) Solving 225 = 90 + -15x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '15x' to each side of the equation. 225 + 15x = 90 + -15x + 15x Combine like terms: -15x + 15x = 0 225 + 15x = 90 + 0 225 + 15x = 90 Add '-225' to each side of the equation. 225 + -225 + 15x = 90 + -225 Combine like terms: 225 + -225 = 0 0 + 15x = 90 + -225 15x = 90 + -225 Combine like terms: 90 + -225 = -135 15x = -135 Divide each side by '15'. x = -9 Simplifying x = -9
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