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Simplifying X + (x + -21) = 157 Reorder the terms: X + (-21 + x) = 157 Remove parenthesis around (-21 + x) X + -21 + x = 157 Reorder the terms: -21 + X + x = 157 Solving -21 + X + x = 157 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '21' to each side of the equation. -21 + X + 21 + x = 157 + 21 Reorder the terms: -21 + 21 + X + x = 157 + 21 Combine like terms: -21 + 21 = 0 0 + X + x = 157 + 21 X + x = 157 + 21 Combine like terms: 157 + 21 = 178 X + x = 178 Add '-1x' to each side of the equation. X + x + -1x = 178 + -1x Combine like terms: x + -1x = 0 X + 0 = 178 + -1x X = 178 + -1x Simplifying X = 178 + -1x
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