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Simplifying 9x2 = 9x2 + -21x + -21x + 49 Reorder the terms: 9x2 = 49 + -21x + -21x + 9x2 Combine like terms: -21x + -21x = -42x 9x2 = 49 + -42x + 9x2 Add '-9x2' to each side of the equation. 9x2 + -9x2 = 49 + -42x + 9x2 + -9x2 Combine like terms: 9x2 + -9x2 = 0 0 = 49 + -42x + 9x2 + -9x2 Combine like terms: 9x2 + -9x2 = 0 0 = 49 + -42x + 0 0 = 49 + -42x Solving 0 = 49 + -42x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '42x' to each side of the equation. 0 + 42x = 49 + -42x + 42x Remove the zero: 42x = 49 + -42x + 42x Combine like terms: -42x + 42x = 0 42x = 49 + 0 42x = 49 Divide each side by '42'. x = 1.166666667 Simplifying x = 1.166666667
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