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Simplifying -21 + 6x = 15 + 4x Solving -21 + 6x = 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. -21 + 6x + -4x = 15 + 4x + -4x Combine like terms: 6x + -4x = 2x -21 + 2x = 15 + 4x + -4x Combine like terms: 4x + -4x = 0 -21 + 2x = 15 + 0 -21 + 2x = 15 Add '21' to each side of the equation. -21 + 21 + 2x = 15 + 21 Combine like terms: -21 + 21 = 0 0 + 2x = 15 + 21 2x = 15 + 21 Combine like terms: 15 + 21 = 36 2x = 36 Divide each side by '2'. x = 18 Simplifying x = 18
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