In Exercises 21 to 26, solve for the indicated variable. Solve for x4: 3x2 - x3 + 2x4 =
Chapter , Problem 7.5.25(choose chapter or problem)
In Exercises 21 to 26, solve for the indicated variable. Solve for x4: 3x2 - x3 + 2x4 = 15x1 + x2 + 3x3 - x4 = -4x1 - 2x2 + 9x4 = 52x1 + 2x3 = 3
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