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2) 21m^2 - 28
3) 5(p-q) / p(p-q) = 5p
4) 1/(p+q)
5) p(p-r)/ q(p-r) = p/q
6) 2x-3
7) 1/(x+6)
8) (x+7)
9) (x-5y)(x+5y)/ x(x-5y) = (x+5)/ x
10). 2x(4) + 3(x) / (12) = 11x/12
11) 3(3x-2) = -6(x-4)
9x +6x = 24 +6
x = 2
12) {1(a+2)+(a+3) } / (a^2 -4)
= (2a+5)/(a^2 - 4)