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3x= 48-12
3x= 36
x = 36/3 = 12
x+12 = 4x+3
12-3 = 4x-x
9 = 3x
x = 9/3 = 3
kuncinya, kalau pindah ruas jadi berubah tanda. tadinya + menjadi - dan sebaliknya
3x = 48 - 12
x = 48 - 12/3
x = 16 - 4
x = 12
Cek jawaban jika x = 12
3x + 12 = 48
3.12 + 12 = 48
36 + 12 = 48 (sama, berarti benar)
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x + 12 = 4x + 3
x - 4x = 3 - 12
-3x = -9
x = -9/-3
x = 3
Cek jawaban jika x = 3
x + 12 = 4x + 3
3 + 12 = 4.3 + 3
15 = 12 + 3
15 = 15 (hasilnya sama, berarti benar)