Setup:
"3 times a number" ==> 3x
"The sum of 3 time a number an 7" ==> 3x + 7
"The sum of 3 time a number an 7 is 4." ==> 3x + 7 = 4
Now solve of x:
3x + 7 = 4 | -7
3x = -3 | /3
x = -1
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