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5x/10 + 4x/10 = 3/5
9x/10 = 3/5
9x = 3/5 × 10
9x = 6
x = 6/9 = 2/3
*2.
*3. (x2 - 9)/(x - 3) = 0
x2 - 9 = 0
x = +/- 3 = ( x - 3)×(x + 3)
[(x - 3)×(x + 3)] / (× - 3) = 0
(x + 3) =0
x = -3