three x minus five equal twenty

i really dont understand and if please show how you get` the answer i can understand it better
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2 Answers

3x - 5 = 20

add 5 to both sides:

3x = 25

divide both sides by 3:

x = 25/3
by Level 6 User (23.1k points)
Seven minus three times the sum of a number (x) and  two as a variable expression. Then solve the equation, if x=4.
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