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5x - 4 = 30 + 3x / 4
5x - 4 (4) = 30 + 3x
4 (4) = 30 + 3x + 5x
-30 + 4 (4) = 8x
8x = -30 + 4 (4)
8x = -26 (4)
8x = -104
x = -104/8
x = -13