a) x + 7 - 12 = 5
b) y : 6 - 11 = 9
c) (5x-2) : 3 = 11
d) 4 * (y - 2) + 4 = 52
e) (2y + 1) * 5 = 35
f) [8 * (2+3d) - 10] : 6 - 4 = 5
g) (c-3 ósmych * 5 - 9) 6 + 14 = 20
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a) x + 7 - 12 = 5
x=5-7+12
x=10
b) y : 6 - 11 = 9
y/6-11=9
y/6=9+11
y/6=20*6
y=120
d) 4 * (y - 2) + 4 = 52
4y-8+4=52
4y=52+8-4
4y=56:4
y=14
e) (2y + 1) * 5 = 35
10y+5=35
10y=35-5
10y=30:10
y=3