Solve the following equation
750-25c+20c=690
Solve for c
750 - 25c + 20c = 690
(-25 + 20)c = -5c
-5c + 750 = + 690
Group our constants 750 and 690. subtract 750 from both sides
-5c + 750 - 750 = 690 - 750
-5c = -60
c = 12
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