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Simplifying 51 = x + -1(-21) Multiply -1 * -21 51 = x + 21 Reorder the terms: 51 = 21 + x Solving 51 = 21 + x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. 51 + -1x = 21 + x + -1x Combine like terms: x + -1x = 0 51 + -1x = 21 + 0 51 + -1x = 21 Add '-51' to each side of the equation. 51 + -51 + -1x = 21 + -51 Combine like terms: 51 + -51 = 0 0 + -1x = 21 + -51 -1x = 21 + -51 Combine like terms: 21 + -51 = -30 -1x = -30 Divide each side by '-1'. x = 30 Simplifying x = 30
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