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Simplifying 9X + 4 = -7X + 644 Reorder the terms: 4 + 9X = -7X + 644 Reorder the terms: 4 + 9X = 644 + -7X Solving 4 + 9X = 644 + -7X Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '7X' to each side of the equation. 4 + 9X + 7X = 644 + -7X + 7X Combine like terms: 9X + 7X = 16X 4 + 16X = 644 + -7X + 7X Combine like terms: -7X + 7X = 0 4 + 16X = 644 + 0 4 + 16X = 644 Add '-4' to each side of the equation. 4 + -4 + 16X = 644 + -4 Combine like terms: 4 + -4 = 0 0 + 16X = 644 + -4 16X = 644 + -4 Combine like terms: 644 + -4 = 640 16X = 640 Divide each side by '16'. X = 40 Simplifying X = 40
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