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Simplifying x2 + -21 = 2x2 Reorder the terms: -21 + x2 = 2x2 Solving -21 + x2 = 2x2 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2x2' to each side of the equation. -21 + x2 + -2x2 = 2x2 + -2x2 Combine like terms: x2 + -2x2 = -1x2 -21 + -1x2 = 2x2 + -2x2 Combine like terms: 2x2 + -2x2 = 0 -21 + -1x2 = 0 Add '21' to each side of the equation. -21 + 21 + -1x2 = 0 + 21 Combine like terms: -21 + 21 = 0 0 + -1x2 = 0 + 21 -1x2 = 0 + 21 Combine like terms: 0 + 21 = 21 -1x2 = 21 Divide each side by '-1'. x2 = -21 Simplifying x2 = -21 Reorder the terms: 21 + x2 = -21 + 21 Combine like terms: -21 + 21 = 0 21 + x2 = 0 The solution to this equation could not be determined.
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