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2) (x+y) / (x-y)
3) x+3 =8
x=8-3
x=5
4) x-20 = 20-x
x= 20
5) 3/5 x + 1/4
6) 5 * x/10
X/2
7) 3x * x/3
x^2
Espero te sirva !! ^^