1.2z is a like term. y and 1.2y is not like terms because there are two of them.
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12y + 5 = 53 12y = 48 y = 4
y^2 - 12y + 36 = 9 subtract 9 from each side y^2 - 12y + 27 = 0 easy factoring by inspection (y - 3)(y - 9) y = 3 y = 9
12y = 8x + 24 so y = 2x/3 + 2
12y+2=146 12y=146-2 12y=144 144/12 12x12=144 y=12
12y = 132y = 132/12y = 11