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Simplifying X + x(7 + x) = 137 X + (7 * x + x * x) = 137 X + (7x + x2) = 137 Solving X + 7x + x2 = 137 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. X + 7x + -7x + x2 = 137 + -7x Combine like terms: 7x + -7x = 0 X + 0 + x2 = 137 + -7x X + x2 = 137 + -7x Add '-1x2' to each side of the equation. X + x2 + -1x2 = 137 + -7x + -1x2 Combine like terms: x2 + -1x2 = 0 X + 0 = 137 + -7x + -1x2 X = 137 + -7x + -1x2 Simplifying X = 137 + -7x + -1x2
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