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x - 2x = 36 + 12
-x = 48
x = -48
2. -10a-9=3
-10a = 3 + 9
-10a = 12
a = -12/10
a =- 6/5
3. 6-5y=9-4y
-5y + 4y = 9 - 6
-y = 3
y = -3
x = 48
2. -10a= 3 + 9
-10 a = 11
a = - 1,1 atau a = -11/10
3. - 5y + 4y = 9 - 6
y = -3