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2a - 1= 3a - 5a
2a - 1= -2a
2a + 2a= 1
4a= 1
a= 1/4
Jadi, nilai a= 1/4
No. 2
3q - 1= q + 3q
3q - 1= 4q
3q - 4q= 1
-q= 1
q= -1
Jadi, nilai q= 1.
No. 3
12 + 3a= 5 + 2a
12 - 5= 2a - 3a
7= -a
-a= 7
a= -7
Jadi, nilai a= -7
No. 4
18 + 7x= 6x - 8x
18= 6x - 8x - 7x
18= -2x - 7x
18= -9x
-9x= 18
x= 18/-9
x= -2
Jadi, nilai x= -2.