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a. (3r -4)/5 + (2-r)/3 =3(3r-4) +5(2-r)
= (9r -12 +10 -5r)/15
= (4r-2)/15
b. 2/a^2 -2/c^2d =2(c^2d -2(a^2)/a^2c^2d
= 2c^2d -2a^2/a^2c^2d
=2(c^2d –a^2)/a^c^2d
joseph rimiru answered the question on October 24, 2017 at 19:32
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