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Simplifying 7(x + -3) + -2z = 9 Reorder the terms: 7(-3 + x) + -2z = 9 (-3 * 7 + x * 7) + -2z = 9 (-21 + 7x) + -2z = 9 Solving -21 + 7x + -2z = 9 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 + 7x + 21 + -2z = 9 + 21 Reorder the terms: -21 + 21 + 7x + -2z = 9 + 21 Combine like terms: -21 + 21 = 0 0 + 7x + -2z = 9 + 21 7x + -2z = 9 + 21 Combine like terms: 9 + 21 = 30 7x + -2z = 30 Add '2z' to each side of the equation. 7x + -2z + 2z = 30 + 2z Combine like terms: -2z + 2z = 0 7x + 0 = 30 + 2z 7x = 30 + 2z Divide each side by '7'. x = 4.285714286 + 0.2857142857z Simplifying x = 4.285714286 + 0.2857142857z
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