450
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15=30-3x 15-30=3x -15=3x -15/3=x -5=x
30% of 15 = 0.3 x 15 = .45
30 + 5x = 15 + 10x 30 = 15 + 5x 15 = 5x x = 3
3 x 5 = 15 2 x 3 x 5 = 30 2 x 3 x 5 = 30, the LCM
1 x 30, 2 x 15, 3 x 10, 5 x 6, 6 x 5, 10 x 3, 15 x 2, 30 x 1.