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5x:2=18 /*2
5x=36 /:5
x=7,2
b.
20/x=35 /*x
20=35x /:35
x=20/35=4/7
5x=18 x 2
5x=36/:5
x=7,2
20/x=35
x=35-20
x=15
5x=36/5
x=7⅕
20/x=35 /*x
20=35x/:35
x=20/35=4/7