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4*x-((1/7)*y) = 3 // - 3
4*x-((1/7)*y)-3 = 0
4*x+(-1/7)*y-3 = 0
4*x-1/7*y-3 = 0 // + -1/7*y-3
4*x = -(-1/7*y-3) // : 4
x = (-(-1/7*y-3))/4
x = (3-(-1/7*y))/4
x = (3-(-1/7*y))/4
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