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126=2x+3x+2x
126=7x
x=126/7
x=18
disubtitusikan
2x= 2.18 = 36
3x= 3.18 = 54
jadi panjang masing" sisi adalah 36cm,36cm dan 54cm
7x = 126
x = 18
jadi panjang sisi sisinya :
1. 2x = 2 . 18 = 36
2. 2x = 2. 18 = 36
3. 3x = 3 . 18 = 54