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Simplifying 12x2 + -21x + 9 = 12x2 + -49x + -4 Reorder the terms: 9 + -21x + 12x2 = 12x2 + -49x + -4 Reorder the terms: 9 + -21x + 12x2 = -4 + -49x + 12x2 Add '-12x2' to each side of the equation. 9 + -21x + 12x2 + -12x2 = -4 + -49x + 12x2 + -12x2 Combine like terms: 12x2 + -12x2 = 0 9 + -21x + 0 = -4 + -49x + 12x2 + -12x2 9 + -21x = -4 + -49x + 12x2 + -12x2 Combine like terms: 12x2 + -12x2 = 0 9 + -21x = -4 + -49x + 0 9 + -21x = -4 + -49x Solving 9 + -21x = -4 + -49x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '49x' to each side of the equation. 9 + -21x + 49x = -4 + -49x + 49x Combine like terms: -21x + 49x = 28x 9 + 28x = -4 + -49x + 49x Combine like terms: -49x + 49x = 0 9 + 28x = -4 + 0 9 + 28x = -4 Add '-9' to each side of the equation. 9 + -9 + 28x = -4 + -9 Combine like terms: 9 + -9 = 0 0 + 28x = -4 + -9 28x = -4 + -9 Combine like terms: -4 + -9 = -13 28x = -13 Divide each side by '28'. x = -0.4642857143 Simplifying x = -0.4642857143
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