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3x-3a=8-x
3x+x=8+3a
4x=8+3a
x=8:4+3a
x=2+3a
penyelesaian x-7
=2+3a-7
=3a-5
3x-3a=8-x
4x=3a+8
x=(3a+8)/4
x=(3/4)a+2,
sehingga (x-7)=(3/4)a-5