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Addition
Subtraction
Multiplication
Division
Substitution
100
x + 4 = 25
What is 21
100
x - 2 = 6
What is 8
100
9x = -27
What is -3
100
y/-6 = 2
What is -12
100

a+b-c = 

a=3, b=(-9), c=5 



What is -11
200
a + 13 = 10
What is -3
200
d - 7 = -9
What is -2
200
-7x = -63
What is 9
200
x/4 = -14
What is -56
200

2c+3a-4b=

a=(-6), b=(-3), c=4 

What is 2
300
n + (-8) = -14
What is -6
300
k - (-83) =121
What is 38
300
-5e = -400
What is 80
300
x/6 = -6
What is -36
300

3z+xy=

x=2, y=9, z=(-5) 

What is 3
400
x + 36 = -100
What is -136
400
x - 327 = -665
What is -338
400
-11x = 275
What is -25
400
-28 = a/-13
What is 364
400

y(z+x)=

w=(-6), x=4, y=3, z=(-8) 

What is -42
500
-27 = c + 27
What is -56
500
a - (-163) = -392
What is -555
500
-21y = -756
What is 36
500
-80 = x/15
What is -1200
500

wz-4xy=

w=(-6), x=4, y=3, z=(-8) 

What is 0