What is the answer to this equation: 7.4 - 9 - 2r =18
2 answers:
The answer to the equation is r=-9.8
First combine the like terms of the equation.
7.4-9-2r=18
7.4+(-9)=-1.6
-1.6-2r=18
Continue by adding 1.6 to both sides of the equation to isolate the variable.
-1.6-2r=18
+1.6 +1.6
-----------------
-2r=19.6
Divide -2 on both sides.
= 
r=-9.8
We can get the answer to this equation by solving for the variable (r).
7.4 - 9 - 2r = 18
We want to get r on one side, so we want to push everything else to the other side.
-2r = 18 - 7.4 + 9
-2r = 19.6
2r = -19.6
r = -9.8
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