5x-2x=15-3
3x=12
x=12/3
x=4
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pindahkan 3 ke ruas kanan. (pindah ruas,+ jadi - dan sbaliknya)
5x = 2x + 15 - 3
pindahkan 2x keruas kiri.
5x - 2x = 15 - 3
3x = 12
x= 12÷3
x = 4
5x-2x=15-3
3x=12
x=12/3
x=4