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Simplifying 4 + -5(1 + -9x) = -20 4 + (1 * -5 + -9x * -5) = -20 4 + (-5 + 45x) = -20 Combine like terms: 4 + -5 = -1 -1 + 45x = -20 Solving -1 + 45x = -20 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + 45x = -20 + 1 Combine like terms: -1 + 1 = 0 0 + 45x = -20 + 1 45x = -20 + 1 Combine like terms: -20 + 1 = -19 45x = -19 Divide each side by '45'. x = -0.4222222222 Simplifying x = -0.4222222222
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