2x+9= 35
Move 9 to the other side
positive +9 changes to negative -9
2x+9-9= 35-9
2x= 26
Divide by 2 for 2x and 26
2x/2= 26/2
x= 13
Check answer by using substitution method
2(13)+9= 35
26+9= 35
35= 35
Answer : x= 13 ( first choice)
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