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Simplifying X + (x + -7) = 21 Reorder the terms: X + (-7 + x) = 21 Remove parenthesis around (-7 + x) X + -7 + x = 21 Reorder the terms: -7 + X + x = 21 Solving -7 + X + x = 21 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '7' to each side of the equation. -7 + X + 7 + x = 21 + 7 Reorder the terms: -7 + 7 + X + x = 21 + 7 Combine like terms: -7 + 7 = 0 0 + X + x = 21 + 7 X + x = 21 + 7 Combine like terms: 21 + 7 = 28 X + x = 28 Add '-1x' to each side of the equation. X + x + -1x = 28 + -1x Combine like terms: x + -1x = 0 X + 0 = 28 + -1x X = 28 + -1x Simplifying X = 28 + -1x
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