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3x+2x=10+5
5x=15
x=15/5
x=3
4x-7=4(3)-7
=12-7
4x-7=5
3x+2x=10+15
5x=15
x=15/5
x=3
jadi 4x-7 = ?
4(3) - 7=
12-7 = 5
semoga bermanfaat