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18=3x
6=x
x+3=6+3
=9
2x - 5x = -11-7
-7x = -18
x = -18/-7
x = 18/7
jadi, nilai (x + 3)
= x + 3
= 18/7 + 3/1
= 18 /7 + 21/7
= 39/7