Persamaan linier dari x+7=5x+15
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biar mudah dibalik dulu
5x+15=x+7
x yg disebelah kanan pindah menjadi negatif dan 15 dikiri pindah menjadi negatif
5x-x=7-15
4x=-8
x= -8/4
x= -2 (negatif 2)
x - 5x = 15 -7
-4x = 8
x = 8/-4
x = -2