Odd sized lumber. 4 times 3 = 12
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x/5 = 3 Multiply both sides by '5' x = 15
x3 - 3x2 + x - 3 = (x - 3)(x2 + 1)
520
okay if x-4=3 then x=7 bcause 4+3=x = 4+3=7 and 7-4=3!
(x - 3)/(12 - 4x) = (x - 3)/[4(3 - x)] = (x - 3)/[-4(x - 3)] = 1/-4 = -(1/4)