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Simplifying 7x + -12 = 15 + 4x Reorder the terms: -12 + 7x = 15 + 4x Solving -12 + 7x = 15 + 4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4x' to each side of the equation. -12 + 7x + -4x = 15 + 4x + -4x Combine like terms: 7x + -4x = 3x -12 + 3x = 15 + 4x + -4x Combine like terms: 4x + -4x = 0 -12 + 3x = 15 + 0 -12 + 3x = 15 Add '12' to each side of the equation. -12 + 12 + 3x = 15 + 12 Combine like terms: -12 + 12 = 0 0 + 3x = 15 + 12 3x = 15 + 12 Combine like terms: 15 + 12 = 27 3x = 27 Divide each side by '3'. x = 9 Simplifying x = 9
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