x + 4 = 25
คำตอบคือ x = 21
x - 2 = 6
What is 8
9x = -27
What is -3
y/-6 = 2
What is -12
m + 3.7 = 2.4
What is -1.3
a + 13 = 10
k - (-83) =121
What is 38
-5e = -400
What is 80
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