since M is a midpoint between p and Q
Then;
PM = MQ
7x + 8 = 5x + 20
collect like term;
7x - 5x = 20 -8
2x = 12
divide both-side 0f the equation by 2
x= 6
MQ = 5x + 20
substitute x=6 into the above
MQ = 5(6) + 20= 30+20 = 50
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