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R = S + 2T
S = 3T .... substitute
R = (3T) + 2T
R = 5T
4(x + y - 5) = 0
y=3x+12
7x = -3y + 12
-8
20+6=6+20
f(x)=5x+2
23
y = -x-2
== == y = -x + 5
69
20 = 400
y=-x+8
4y = 3x+11 or as y = 3/4x+11/4