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2a=15
a=7.5
b. 4(a-3)=10
4a-12=10
4a=22
a=22:4
a=5.5
c. a^2-16=o
a^2=16
a=akar dri 16
a=4
2a + 5= 20
2a= 20 - 5
2a= 15
a= 15/2
a= 7,5
b.
4(a - 3)= 10
4a - 12= 10
4a= 10 + 12
4a= 22
a= 22/4
a= 11/2
a= 5,5
c.
a² - 16= 0
a²= 16
a= √16
a= 4