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Simplifying 3(x + -5) = 21x Reorder the terms: 3(-5 + x) = 21x (-5 * 3 + x * 3) = 21x (-15 + 3x) = 21x Solving -15 + 3x = 21x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21x' to each side of the equation. -15 + 3x + -21x = 21x + -21x Combine like terms: 3x + -21x = -18x -15 + -18x = 21x + -21x Combine like terms: 21x + -21x = 0 -15 + -18x = 0 Add '15' to each side of the equation. -15 + 15 + -18x = 0 + 15 Combine like terms: -15 + 15 = 0 0 + -18x = 0 + 15 -18x = 0 + 15 Combine like terms: 0 + 15 = 15 -18x = 15 Divide each side by '-18'. x = -0.8333333333 Simplifying x = -0.8333333333
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