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Simplifying 0 = 9x + -3(7y + -4x) Reorder the terms: 0 = 9x + -3(-4x + 7y) 0 = 9x + (-4x * -3 + 7y * -3) 0 = 9x + (12x + -21y) Combine like terms: 9x + 12x = 21x 0 = 21x + -21y Solving 0 = 21x + -21y 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. 0 + -21x = 21x + -21x + -21y Remove the zero: -21x = 21x + -21x + -21y Combine like terms: 21x + -21x = 0 -21x = 0 + -21y -21x = -21y Divide each side by '-21'. x = y Simplifying x = y
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