Addition
x + 5 = 10
x = 5
z - 7 = 1
4x = 16
x = 4
a + 5 = 10
a = 5
3 + 2 = x - 4
x = 9
7 + y = 13
y = 6
13 = y - 4
y = 17
9 = 3y
y = 3
13 = y - 7
y = 20
13 - 5 = r - 2
r = 10
r + 3 = 17
r = 14
r - 18 = 2
r = 20
13r = 26
r = 2
10b = 100
b = 10
z - 3 = 14 - 2
z = 15
23 = z + 10
13
-33 + u = 3
u = 36
-16 = -4y
y = 4
-44 = -11c
c = 4
q + 17 = 3 - 5
q = -19
18 + e = 19
e = 1
-13 = q + 13
q = 26
-11x = 22
x = -2
-5 + y = 10
y = 15
1 + 2 + y = 13 - 6
y = 4