7x-1/2y=30

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Solution for 7x-1/2y=30 equation: 


x in (-oo:+oo)

7*x-((1/2)*y) = 30 // - 30

7*x-((1/2)*y)-30 = 0

7*x+(-1/2)*y-30 = 0

7*x-1/2*y-30 = 0 // + -1/2*y-30

7*x = -(-1/2*y-30) // : 7

x = (-(-1/2*y-30))/7

x = (30-(-1/2*y))/7

x = (30-(-1/2*y))/7

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