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91 = 13 x 7 Can't go any further as both 13 and 7 are prime numbers.
9 and 13 both go into 117.
x - 7 - 4 = 13 (-7 - 4 = -13) x - 11 = 13 add 11 to both sides x = 24
the answer -7+x=13 add 7 to both sides. cancel the first set of sevens leavening you with the x and add 13+7=20
7/13 is already in its most sim plified form. Reason ; both '7' and '13' are prime numbers , and therefore do not have any common factors.