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