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3x3+15x2+18x = 3x(x2+5x+6) = 3x(x+2)(x+3)
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3(x + 4)(x + 1)
3x
The LCM is 45x3
x + 5; provided, of course, that x ≠ -10.
-3x + 6 + 15x =11x + 8 ie -3x + 15x - 11x = 8 - 6 ie x = 2