1) y - (2y + 1 2/3 ) - (y - 4/6) =
= y - 2y - 1 2/3 - y + 4/6 =
= (y -2y -y) - (1 4/6 - 4/6) =
= - 2y - 1 = - (2y + 1)
2)
3y * (-2) = - 6y
-1.5 * (-y) = 1.5y
3)
4y - 3 = 2y +7
4y -2y = 7+3
2y=10
y=10 /2
y= 5
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4*5 -3 = 2*5 +7
20 -3 = 10+7
17=17
(a-3)/4 = 4.8/8
8(a-3) = 4 * 4.8
8a - 24 = 19.2
8a = 19.2 +24
8a= 43.2
a=43.2 /8
a=5.4
===============
(5.4 -3) /4 = 4.8/8
2.4/4 = 4.8/8
0.6=0.6