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2013-10-15T20:25:13+02:00
a) 7 * x = 3
7x = 3
x = 3/7

b) x * 5 = 8
5x = 8
x = 8/5

c) x = 13 / 11

d) 13 * x = 11
13x = 11
x = 11/13