5x(6x + 7y + 8)
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2(5x - 1)(3x - 2)
15x2 - 30x -720 = 15(x - 8)(x + 6).
6x^2(2x + 5)
Both terms have a three in common (i.e. you can multiply something "neat" by three and get the original term), so 30x+3 = 3(10x+1).
x = 0.666666666666667 so 100 + (30x0.67) + (30x0.67) = around 180