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Simplifying x + x + 21 + 4x + -30 = 813 Reorder the terms: 21 + -30 + x + x + 4x = 813 Combine like terms: 21 + -30 = -9 -9 + x + x + 4x = 813 Combine like terms: x + x = 2x -9 + 2x + 4x = 813 Combine like terms: 2x + 4x = 6x -9 + 6x = 813 Solving -9 + 6x = 813 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + 6x = 813 + 9 Combine like terms: -9 + 9 = 0 0 + 6x = 813 + 9 6x = 813 + 9 Combine like terms: 813 + 9 = 822 6x = 822 Divide each side by '6'. x = 137 Simplifying x = 137
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