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Simplifying 15 + 21x = 30 + 6x Solving 15 + 21x = 30 + 6x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6x' to each side of the equation. 15 + 21x + -6x = 30 + 6x + -6x Combine like terms: 21x + -6x = 15x 15 + 15x = 30 + 6x + -6x Combine like terms: 6x + -6x = 0 15 + 15x = 30 + 0 15 + 15x = 30 Add '-15' to each side of the equation. 15 + -15 + 15x = 30 + -15 Combine like terms: 15 + -15 = 0 0 + 15x = 30 + -15 15x = 30 + -15 Combine like terms: 30 + -15 = 15 15x = 15 Divide each side by '15'. x = 1 Simplifying x = 1
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