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(1/3)*(15*y-21) = (2/3)*(10*y-35) // - (2/3)*(10*y-35)
(1/3)*(15*y-21)-((2/3)*(10*y-35)) = 0
(1/3)*(15*y-21)+(-2/3)*(10*y-35) = 0
1/3*(15*y-21)-2/3*(10*y-35) = 0
1/3*(15*y-21)-2/3*(10*y-35) = 0
49/3-5/3*y = 0
49/3-5/3*y = 0
49/3-5/3*y = 0 // - 49/3
-5/3*y = -49/3 // : -5/3
y = -49/3/(-5/3)
y = 49/5
y = 49/5
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