1) 8(x+3)=48
x+3=6
x=6-3=3
x=3
2) 3 (a+5) = 36
a + 5 = 12
x = 12 – 5 = 7
x=7
3) (15 – 4 y) • 15 = 45
15 – 4 y = 45/15=3
4y=12
y=3
13) 3 (x – 5) + 8 = 17
3 (x – 5) + 8-8 = 17-8
3 (x – 5)=9
x-5=3
x=8
17) 3 (7 – b) – 5 = 5b
21-3b-5=5b
21-5=5b+3b
8b=16
b=2
21) 6 (x – 3) + 2 (x + 2) = 10
6x – 18 + 2x + 4 = 10
8x – 14 = 10
8x = 24
x = 3
2) 5 (y – 1) = 30
y – 1 = 6
y =6 +1
y = 7
6) 14 = 7 (b – 3)
14 = 7b – 21
7b = 14 + 21 = 35
b = 5
10) -36 = 2 (10 – 7z)
-36 = 20 – 14z
-56 = -14z
z = -56 : (-14) = 4
z = 4
14) 5 (y – 2) – 9 = 11
5y – 10 – 9 = 11
5y−19=11
5y−19+19=11+19
5=30
5y=30
y=6
18) 5c + 2 ( 7 – 2 c) = 11
5c+14−4c=11
5c−4c+14=11
c+14=11
c=11−14
c=−3
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