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Simplifying (x + -21) = 3(y + -21) Reorder the terms: (-21 + x) = 3(y + -21) Remove parenthesis around (-21 + x) -21 + x = 3(y + -21) Reorder the terms: -21 + x = 3(-21 + y) -21 + x = (-21 * 3 + y * 3) -21 + x = (-63 + 3y) Solving -21 + x = -63 + 3y 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 + 21 + x = -63 + 21 + 3y Combine like terms: -21 + 21 = 0 0 + x = -63 + 21 + 3y x = -63 + 21 + 3y Combine like terms: -63 + 21 = -42 x = -42 + 3y Simplifying x = -42 + 3y
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