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Simplifying -1440 = -15(-15x + -21) Reorder the terms: -1440 = -15(-21 + -15x) -1440 = (-21 * -15 + -15x * -15) -1440 = (315 + 225x) Solving -1440 = 315 + 225x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-225x' to each side of the equation. -1440 + -225x = 315 + 225x + -225x Combine like terms: 225x + -225x = 0 -1440 + -225x = 315 + 0 -1440 + -225x = 315 Add '1440' to each side of the equation. -1440 + 1440 + -225x = 315 + 1440 Combine like terms: -1440 + 1440 = 0 0 + -225x = 315 + 1440 -225x = 315 + 1440 Combine like terms: 315 + 1440 = 1755 -225x = 1755 Divide each side by '-225'. x = -7.8 Simplifying x = -7.8
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