1) x*(y - 7)/y*(y - 7) = x/y * (y - 7)/(y + 7) = x/y
2) 15a(a - b)/20b(a - b) = 15a/20b * (a - b)/(a - b) = 3a/4b
1)
2)
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1) x*(y - 7)/y*(y - 7) = x/y * (y - 7)/(y + 7) = x/y
2) 15a(a - b)/20b(a - b) = 15a/20b * (a - b)/(a - b) = 3a/4b
1)
2)