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Simplifying 15 + -3x * 5x = 21 Reorder the terms for easier multiplication: 15 + -3 * 5x * x = 21 Multiply -3 * 5 15 + -15x * x = 21 Multiply x * x 15 + -15x2 = 21 Solving 15 + -15x2 = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + -15x2 = 21 + -15 Combine like terms: 15 + -15 = 0 0 + -15x2 = 21 + -15 -15x2 = 21 + -15 Combine like terms: 21 + -15 = 6 -15x2 = 6 Divide each side by '-15'. x2 = -0.4 Simplifying x2 = -0.4 Reorder the terms: 0.4 + x2 = -0.4 + 0.4 Combine like terms: -0.4 + 0.4 = 0.0 0.4 + x2 = 0.0 The solution to this equation could not be determined.
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