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Simplifying 21 + 10x + -19 = 7x + 30 + -4x Reorder the terms: 21 + -19 + 10x = 7x + 30 + -4x Combine like terms: 21 + -19 = 2 2 + 10x = 7x + 30 + -4x Reorder the terms: 2 + 10x = 30 + 7x + -4x Combine like terms: 7x + -4x = 3x 2 + 10x = 30 + 3x Solving 2 + 10x = 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. 2 + 10x + -3x = 30 + 3x + -3x Combine like terms: 10x + -3x = 7x 2 + 7x = 30 + 3x + -3x Combine like terms: 3x + -3x = 0 2 + 7x = 30 + 0 2 + 7x = 30 Add '-2' to each side of the equation. 2 + -2 + 7x = 30 + -2 Combine like terms: 2 + -2 = 0 0 + 7x = 30 + -2 7x = 30 + -2 Combine like terms: 30 + -2 = 28 7x = 28 Divide each side by '7'. x = 4 Simplifying x = 4
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