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Simplifying 3x + 15 = 21x + 4 Reorder the terms: 15 + 3x = 21x + 4 Reorder the terms: 15 + 3x = 4 + 21x Solving 15 + 3x = 4 + 21x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21x' to each side of the equation. 15 + 3x + -21x = 4 + 21x + -21x Combine like terms: 3x + -21x = -18x 15 + -18x = 4 + 21x + -21x Combine like terms: 21x + -21x = 0 15 + -18x = 4 + 0 15 + -18x = 4 Add '-15' to each side of the equation. 15 + -15 + -18x = 4 + -15 Combine like terms: 15 + -15 = 0 0 + -18x = 4 + -15 -18x = 4 + -15 Combine like terms: 4 + -15 = -11 -18x = -11 Divide each side by '-18'. x = 0.6111111111 Simplifying x = 0.6111111111
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