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Simplifying (X + 4y + -9) + -1(2x + -7y + 12) = 0 Reorder the terms: (-9 + X + 4y) + -1(2x + -7y + 12) = 0 Remove parenthesis around (-9 + X + 4y) -9 + X + 4y + -1(2x + -7y + 12) = 0 Reorder the terms: -9 + X + 4y + -1(12 + 2x + -7y) = 0 -9 + X + 4y + (12 * -1 + 2x * -1 + -7y * -1) = 0 -9 + X + 4y + (-12 + -2x + 7y) = 0 Reorder the terms: -9 + -12 + X + -2x + 4y + 7y = 0 Combine like terms: -9 + -12 = -21 -21 + X + -2x + 4y + 7y = 0 Combine like terms: 4y + 7y = 11y -21 + X + -2x + 11y = 0 Solving -21 + X + -2x + 11y = 0 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 + -2x + 21 + 11y = 0 + 21 Reorder the terms: -21 + 21 + X + -2x + 11y = 0 + 21 Combine like terms: -21 + 21 = 0 0 + X + -2x + 11y = 0 + 21 X + -2x + 11y = 0 + 21 Combine like terms: 0 + 21 = 21 X + -2x + 11y = 21 Add '2x' to each side of the equation. X + -2x + 2x + 11y = 21 + 2x Combine like terms: -2x + 2x = 0 X + 0 + 11y = 21 + 2x X + 11y = 21 + 2x Add '-11y' to each side of the equation. X + 11y + -11y = 21 + 2x + -11y Combine like terms: 11y + -11y = 0 X + 0 = 21 + 2x + -11y X = 21 + 2x + -11y Simplifying X = 21 + 2x + -11y
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