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3*x+6*y = 7/15 // - 7/15
3*x+6*y-(7/15) = 0
3*x+6*y-7/15 = 0
3*x+6*y-7/15 = 0 // - 6*y-7/15
3*x = -(6*y-7/15) // : 3
x = (-(6*y-7/15))/3
x = (7/15-(6*y))/3
x = (7/15-(6*y))/3
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