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Simplifying 6x + 7y(2 + -3y) = -21 6x + (2 * 7y + -3y * 7y) = -21 6x + (14y + -21y2) = -21 Solving 6x + 14y + -21y2 = -21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-14y' to each side of the equation. 6x + 14y + -14y + -21y2 = -21 + -14y Combine like terms: 14y + -14y = 0 6x + 0 + -21y2 = -21 + -14y 6x + -21y2 = -21 + -14y Add '21y2' to each side of the equation. 6x + -21y2 + 21y2 = -21 + -14y + 21y2 Combine like terms: -21y2 + 21y2 = 0 6x + 0 = -21 + -14y + 21y2 6x = -21 + -14y + 21y2 Divide each side by '6'. x = -3.5 + -2.333333333y + 3.5y2 Simplifying x = -3.5 + -2.333333333y + 3.5y2
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