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Simplifying x + 18 = 30 + 3x Reorder the terms: 18 + x = 30 + 3x Solving 18 + x = 30 + 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. 18 + x + -3x = 30 + 3x + -3x Combine like terms: x + -3x = -2x 18 + -2x = 30 + 3x + -3x Combine like terms: 3x + -3x = 0 18 + -2x = 30 + 0 18 + -2x = 30 Add '-18' to each side of the equation. 18 + -18 + -2x = 30 + -18 Combine like terms: 18 + -18 = 0 0 + -2x = 30 + -18 -2x = 30 + -18 Combine like terms: 30 + -18 = 12 -2x = 12 Divide each side by '-2'. x = -6 Simplifying x = -6
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