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Simplifying 9 + -10(x + 3) = 20 Reorder the terms: 9 + -10(3 + x) = 20 9 + (3 * -10 + x * -10) = 20 9 + (-30 + -10x) = 20 Combine like terms: 9 + -30 = -21 -21 + -10x = 20 Solving -21 + -10x = 20 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 + -10x = 20 + 21 Combine like terms: -21 + 21 = 0 0 + -10x = 20 + 21 -10x = 20 + 21 Combine like terms: 20 + 21 = 41 -10x = 41 Divide each side by '-10'. x = -4.1 Simplifying x = -4.1
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