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<=> 7 = 10/2y
<=> 7 : 10/2 = y
<=> 14/10 = y
<=> 1,4 = y
1/3y + 5 = 1/2 y - 2 ---------> x 6
2y + 30 = y - 12
2y -y = -12 -30
y = - 32