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u2=8(2) + 62 = 78
u3 = 8(3) + 62 =86
u4 = 94
u5 = 102
b) u7= a + 6b
62 = 8 + 6b
6b=54
b= 54÷6
=9
u5= 8 + (5-1)9
=44