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Simplifying (-8x + -21) + -1(15x + -4) = 0 Reorder the terms: (-21 + -8x) + -1(15x + -4) = 0 Remove parenthesis around (-21 + -8x) -21 + -8x + -1(15x + -4) = 0 Reorder the terms: -21 + -8x + -1(-4 + 15x) = 0 -21 + -8x + (-4 * -1 + 15x * -1) = 0 -21 + -8x + (4 + -15x) = 0 Reorder the terms: -21 + 4 + -8x + -15x = 0 Combine like terms: -21 + 4 = -17 -17 + -8x + -15x = 0 Combine like terms: -8x + -15x = -23x -17 + -23x = 0 Solving -17 + -23x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '17' to each side of the equation. -17 + 17 + -23x = 0 + 17 Combine like terms: -17 + 17 = 0 0 + -23x = 0 + 17 -23x = 0 + 17 Combine like terms: 0 + 17 = 17 -23x = 17 Divide each side by '-23'. x = -0.7391304348 Simplifying x = -0.7391304348
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