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3x + 3 - 5 = 13
3x - 2 = 13
3x = 13 + 2
3x = 15
3x : 3 = 15 : 3
x = 5
jadi
3x+3-5=13
3x-2=13
3x=13+2
3x= 15
x=15 : 3
x=5