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Sagot :

R= 15

25 + R = 40
-25 -25
___________
R = 40 - 25
R = 15

You have to isolate your variable (the letter in a mathematical equation) by combining similar terms (all real numbers should go together and all variables should go with like variables [R’s go together]). And remover that what you do to one side you have to do to the other.