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Simplifying x + -1(-21) + -1(-21) + -1(-21) = x Multiply -1 * -21 x + 21 + -1(-21) + -1(-21) = x Multiply -1 * -21 x + 21 + 21 + -1(-21) = x Multiply -1 * -21 x + 21 + 21 + 21 = x Reorder the terms: 21 + 21 + 21 + x = x Combine like terms: 21 + 21 = 42 42 + 21 + x = x Combine like terms: 42 + 21 = 63 63 + x = x Add '-1x' to each side of the equation. 63 + x + -1x = x + -1x Combine like terms: x + -1x = 0 63 + 0 = x + -1x 63 = x + -1x Combine like terms: x + -1x = 0 63 = 0 Solving 63 = 0 Couldn't find a variable to solve for. This equation is invalid, the left and right sides are not equal, therefore there is no solution.
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