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Simplifying 30 + -5x = 12 + -7x Solving 30 + -5x = 12 + -7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7x' to each side of the equation. 30 + -5x + 7x = 12 + -7x + 7x Combine like terms: -5x + 7x = 2x 30 + 2x = 12 + -7x + 7x Combine like terms: -7x + 7x = 0 30 + 2x = 12 + 0 30 + 2x = 12 Add '-30' to each side of the equation. 30 + -30 + 2x = 12 + -30 Combine like terms: 30 + -30 = 0 0 + 2x = 12 + -30 2x = 12 + -30 Combine like terms: 12 + -30 = -18 2x = -18 Divide each side by '2'. x = -9 Simplifying x = -9
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