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2y = 13 - 7
y = 3
b. 30 + 2 =3x
32 = 3x
32/3 = x
c. 3a + 15/5 = 6
3a = 6 - 15/5
3a = 3
a = 1
d. 9 ( 4x - 3 ) - 6( x - 4 ) = 7
36x - 27 - 6x + 24 = 7
30x - 3 = 7
30x = 10
x = 1/3