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Simplifying -3x + 2y + 2z = 21 Solving -3x + 2y + 2z = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2y' to each side of the equation. -3x + 2y + -2y + 2z = 21 + -2y Combine like terms: 2y + -2y = 0 -3x + 0 + 2z = 21 + -2y -3x + 2z = 21 + -2y Add '-2z' to each side of the equation. -3x + 2z + -2z = 21 + -2y + -2z Combine like terms: 2z + -2z = 0 -3x + 0 = 21 + -2y + -2z -3x = 21 + -2y + -2z Divide each side by '-3'. x = -7 + 0.6666666667y + 0.6666666667z Simplifying x = -7 + 0.6666666667y + 0.6666666667z
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