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A Slight Change to an Equation

SATMAT-UEILKY

If $0.7a-1.3b=5.3$, then what is the value of $0.7a+1.3b$?

(Calculator)

A

$15.9$

B

$0.14a$

C

$5.3+1.3b$

D

$5.3+2.6b$