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Simplifying 3x + 21 = 15x Reorder the terms: 21 + 3x = 15x Solving 21 + 3x = 15x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-15x' to each side of the equation. 21 + 3x + -15x = 15x + -15x Combine like terms: 3x + -15x = -12x 21 + -12x = 15x + -15x Combine like terms: 15x + -15x = 0 21 + -12x = 0 Add '-21' to each side of the equation. 21 + -21 + -12x = 0 + -21 Combine like terms: 21 + -21 = 0 0 + -12x = 0 + -21 -12x = 0 + -21 Combine like terms: 0 + -21 = -21 -12x = -21 Divide each side by '-12'. x = 1.75 Simplifying x = 1.75
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