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2a+11b=29
2a+11b=29 (1) 2a+11b=29 a+2b=18
a+2b=18 (2) 2a+4b=36 - a-2=18
7b = -7 a = 20
b= -1
u31 = a+30b
20+ 30(-1)
20-30
=-10