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Simplifying (y + -3) = 4y + -12 Reorder the terms: (-3 + y) = 4y + -12 Remove parenthesis around (-3 + y) -3 + y = 4y + -12 Reorder the terms: -3 + y = -12 + 4y Solving -3 + y = -12 + 4y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-4y' to each side of the equation. -3 + y + -4y = -12 + 4y + -4y Combine like terms: y + -4y = -3y -3 + -3y = -12 + 4y + -4y Combine like terms: 4y + -4y = 0 -3 + -3y = -12 + 0 -3 + -3y = -12 Add '3' to each side of the equation. -3 + 3 + -3y = -12 + 3 Combine like terms: -3 + 3 = 0 0 + -3y = -12 + 3 -3y = -12 + 3 Combine like terms: -12 + 3 = -9 -3y = -9 Divide each side by '-3'. y = 3 Simplifying y = 3