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2x - 5x = 8 + 7
-3x = 15
x=15/-3
x= -5
x bisa diganti dengan lima. Jika menurut persamaan jumlah sebelah kiri dan kanan sama atau seimbang.
2x-7=8+5x
2(-5)-7=8+5(-5)
-10-7=8-28
-17=-17