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Simplifying 7z + -3(4 + x) = 28 7z + (4 * -3 + x * -3) = 28 7z + (-12 + -3x) = 28 Reorder the terms: -12 + -3x + 7z = 28 Solving -12 + -3x + 7z = 28 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '12' to each side of the equation. -12 + -3x + 12 + 7z = 28 + 12 Reorder the terms: -12 + 12 + -3x + 7z = 28 + 12 Combine like terms: -12 + 12 = 0 0 + -3x + 7z = 28 + 12 -3x + 7z = 28 + 12 Combine like terms: 28 + 12 = 40 -3x + 7z = 40 Add '-7z' to each side of the equation. -3x + 7z + -7z = 40 + -7z Combine like terms: 7z + -7z = 0 -3x + 0 = 40 + -7z -3x = 40 + -7z Divide each side by '-3'. x = -13.33333333 + 2.333333333z Simplifying x = -13.33333333 + 2.333333333z
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