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Simplifying 30 + 15x = 12 + -3x Solving 30 + 15x = 12 + -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 + 15x + 3x = 12 + -3x + 3x Combine like terms: 15x + 3x = 18x 30 + 18x = 12 + -3x + 3x Combine like terms: -3x + 3x = 0 30 + 18x = 12 + 0 30 + 18x = 12 Add '-30' to each side of the equation. 30 + -30 + 18x = 12 + -30 Combine like terms: 30 + -30 = 0 0 + 18x = 12 + -30 18x = 12 + -30 Combine like terms: 12 + -30 = -18 18x = -18 Divide each side by '18'. x = -1 Simplifying x = -1
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