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Simplifying -21 + 5x = 51 + 9x Solving -21 + 5x = 51 + 9x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9x' to each side of the equation. -21 + 5x + -9x = 51 + 9x + -9x Combine like terms: 5x + -9x = -4x -21 + -4x = 51 + 9x + -9x Combine like terms: 9x + -9x = 0 -21 + -4x = 51 + 0 -21 + -4x = 51 Add '21' to each side of the equation. -21 + 21 + -4x = 51 + 21 Combine like terms: -21 + 21 = 0 0 + -4x = 51 + 21 -4x = 51 + 21 Combine like terms: 51 + 21 = 72 -4x = 72 Divide each side by '-4'. x = -18 Simplifying x = -18
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