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Simplifying 7y + -2 + x + 3 = 21 Reorder the terms: -2 + 3 + x + 7y = 21 Combine like terms: -2 + 3 = 1 1 + x + 7y = 21 Solving 1 + x + 7y = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + x + -1 + 7y = 21 + -1 Reorder the terms: 1 + -1 + x + 7y = 21 + -1 Combine like terms: 1 + -1 = 0 0 + x + 7y = 21 + -1 x + 7y = 21 + -1 Combine like terms: 21 + -1 = 20 x + 7y = 20 Add '-7y' to each side of the equation. x + 7y + -7y = 20 + -7y Combine like terms: 7y + -7y = 0 x + 0 = 20 + -7y x = 20 + -7y Simplifying x = 20 + -7y
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