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Simplifying X + 20 + 7x = 90 Reorder the terms: 20 + X + 7x = 90 Solving 20 + X + 7x = 90 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + X + -20 + 7x = 90 + -20 Reorder the terms: 20 + -20 + X + 7x = 90 + -20 Combine like terms: 20 + -20 = 0 0 + X + 7x = 90 + -20 X + 7x = 90 + -20 Combine like terms: 90 + -20 = 70 X + 7x = 70 Add '-7x' to each side of the equation. X + 7x + -7x = 70 + -7x Combine like terms: 7x + -7x = 0 X + 0 = 70 + -7x X = 70 + -7x Simplifying X = 70 + -7x
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