Denise G. answered 11/06/19
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sum is addition
twice is multiplication by 2
the number is x
seven is 7
is is equal
This translates to
2x+7=13
Subtract 7 from both sides
2x+7-7=13-7
Simplify
2x=6
Divide both sides by 2
2x/2=6/2
x=3