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Simplifying -8x + -9x + -21 = -12 + -16 Reorder the terms: -21 + -8x + -9x = -12 + -16 Combine like terms: -8x + -9x = -17x -21 + -17x = -12 + -16 Combine like terms: -12 + -16 = -28 -21 + -17x = -28 Solving -21 + -17x = -28 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + -17x = -28 + 21 Combine like terms: -21 + 21 = 0 0 + -17x = -28 + 21 -17x = -28 + 21 Combine like terms: -28 + 21 = -7 -17x = -7 Divide each side by '-17'. x = 0.4117647059 Simplifying x = 0.4117647059
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