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7+8=2x+3x
15=5x
x=15/5=3
7 - 7 - 3x = 2x - 8 - 7 ( dikurangi 7 )
- 3x = 2x - 15
- 3x - 2x = 2x - 2x - 15 ( dikurangi 2x )
- 5x = - 15
x = 3