Answer :

s=2r+3x

Move 2r to the other side. Sign changes from +2r to -2r.

s-2r=2r-2r+3x

s-2r=3x

Divide by 3 for both sides

s/3-2r/3=3/3x

x=s/3-2r/3

Answer: x=s/3-2r/3

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