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Simplifying 21y + 63 + -3x = 0 Reorder the terms: 63 + -3x + 21y = 0 Solving 63 + -3x + 21y = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-63' to each side of the equation. 63 + -3x + -63 + 21y = 0 + -63 Reorder the terms: 63 + -63 + -3x + 21y = 0 + -63 Combine like terms: 63 + -63 = 0 0 + -3x + 21y = 0 + -63 -3x + 21y = 0 + -63 Combine like terms: 0 + -63 = -63 -3x + 21y = -63 Add '-21y' to each side of the equation. -3x + 21y + -21y = -63 + -21y Combine like terms: 21y + -21y = 0 -3x + 0 = -63 + -21y -3x = -63 + -21y Divide each side by '-3'. x = 21 + 7y Simplifying x = 21 + 7y
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