Sagot :
Adım adım açıklama:
a= 180-30=150
150+85+65=300
360-300= 60
b=7x+171=360
7x=360-171
7x=189
x=27
c=180-3x+180-5x+180-6x+90+120
=750-14x
750-14x=540
750-540=14x
x=15
d=120+140+135+120+90+160
=765
900-765=135
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