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Simplifying -30 = 3x + 21 Reorder the terms: -30 = 21 + 3x Solving -30 = 21 + 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. -30 + -3x = 21 + 3x + -3x Combine like terms: 3x + -3x = 0 -30 + -3x = 21 + 0 -30 + -3x = 21 Add '30' to each side of the equation. -30 + 30 + -3x = 21 + 30 Combine like terms: -30 + 30 = 0 0 + -3x = 21 + 30 -3x = 21 + 30 Combine like terms: 21 + 30 = 51 -3x = 51 Divide each side by '-3'. x = -17 Simplifying x = -17
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