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3x + 7-7 =25-7
3x:3 = 18:3
x = 6
sori cuman bisa yg pertama doang
3x= 25-7
3x=18
x= 18:3
= 6
51-2t = 15
2t = 15-51
2t = -36
t= -36:2
= -18
5x+13 = 48
5x= 48-13
5x= 35
x= 35: 5
= 7
55+12y=199
12y= 199-55
12y= 144
y= 144:12
= 12
75-4t = 11
4t = 11-75
4t = -64
t= -64: 4
= 16