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Simplifying 4x + 3x + -18 = 31 Reorder the terms: -18 + 4x + 3x = 31 Combine like terms: 4x + 3x = 7x -18 + 7x = 31 Solving -18 + 7x = 31 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '18' to each side of the equation. -18 + 18 + 7x = 31 + 18 Combine like terms: -18 + 18 = 0 0 + 7x = 31 + 18 7x = 31 + 18 Combine like terms: 31 + 18 = 49 7x = 49 Divide each side by '7'. x = 7 Simplifying x = 7
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