If the distance from R to S is only half then the other half is S to T. The distance between R and S is (5,2). that should give you the answer
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move the terms
-5x+20-a
divide both sides
x=-4+1/5a
solution:
x=-4+1/5a
50 People played an instrument. Every 10 people is represented as a 1 in the fraction. 5=50
