a, 96 - 3( y + 1) =42
<=>96 - 3y -3 = 42
<=>96 - 3y = 42 + 3
<=>96 -3y = 45
<=>3y = 51
=> y = 17
b, 12y - 33 = 9.27
=> 12y -33 = 243
=> 12y = 276
=> y =23
, 96 - 3( y + 1) =42
<=>96 - 3y -3 = 42
<=>96 - 3y = 42 + 3
<=>96 -3y = 45
<=>3y = 51
=> y = 17
b, 12y - 33 = 9.27
=> 12y -33 = 243
=> 12y = 276
=> y =23
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