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Simplifying 5y + -15 = 3(2y) + -21 Reorder the terms: -15 + 5y = 3(2y) + -21 Remove parenthesis around (2y) -15 + 5y = 3 * 2y + -21 Multiply 3 * 2 -15 + 5y = 6y + -21 Reorder the terms: -15 + 5y = -21 + 6y Solving -15 + 5y = -21 + 6y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-6y' to each side of the equation. -15 + 5y + -6y = -21 + 6y + -6y Combine like terms: 5y + -6y = -1y -15 + -1y = -21 + 6y + -6y Combine like terms: 6y + -6y = 0 -15 + -1y = -21 + 0 -15 + -1y = -21 Add '15' to each side of the equation. -15 + 15 + -1y = -21 + 15 Combine like terms: -15 + 15 = 0 0 + -1y = -21 + 15 -1y = -21 + 15 Combine like terms: -21 + 15 = -6 -1y = -6 Divide each side by '-1'. y = 6 Simplifying y = 6
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