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6a -17 =55
6a = 72
a = 12
2.(3x +16) +71 = 180
3x + 87= 180
3x = 93
x = 31
3. 3x = 115
x = 35
180-115 =y
65 =y
4z + 5 =115
4z = 110
z = 27,5