\left \{ {{y+15w=370,5} \atop {y - 4w=13,3}} \right
\left \{ {{-y-15w= -370,5} \atop {y - 4w=13,3}} \right
-19w = -357,2w = 18,8 y=13,3 +4wy = 13,3 + 4* 18,8 y = 88,5
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\left \{ {{y+15w=370,5} \atop {y - 4w=13,3}} \right
\left \{ {{-y-15w= -370,5} \atop {y - 4w=13,3}} \right
-19w = -357,2
w = 18,8
y=13,3 +4w
y = 13,3 + 4* 18,8
y = 88,5