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Category 1

100

2 - 5 + x - 1 = 5 + 3

X = 12

200

−4 + x + 6 = −1 + 2

X = -1

300

−7 + x + 5 = 3 − 8

X = -3

400

-5 + x + 7 = -7 -2

X = -11

500

2(3) + X - 5(3) = 2(5)

X = 19

Category 2

100

−2 + x + 9 = 10 − 3

X = 0

200

5(2) - 6 + 2 + x = 4(3)

X = 6

300

−6 + x + 9 = −2 + 3

X = -2

400

4 + 5 + X - 5 -1 = 2+10

X = 9

500

−9 + x + 4 = 2 − 7

X = 0

Category 3

100

−8 + x + 3 = 5 − 6

X = 4

200

−3 + x + 5 = 8 − 4

X = 2

300

17 - 11 + (-4) + X = 9 - 10

X = -3

400

−1 + x + 8 = 9 − 4

X = -2

500

−5 + x + 8 = 6 − 1

X = 2

Click this one if you dare

100

What is a variable? 

A number we don't know represented by a letter, usually X