y-40=-21/4(x-20)

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Solution for y-40=-21/4(x-20) equation: 


x in (-oo:+oo)

y-40 = (-21/4)*(x-20) // - (-21/4)*(x-20)

y-((-21/4)*(x-20))-40 = 0

(21/4)*(x-20)+y-40 = 0

21/4*(x-20)+y-40 = 0

21/4*(x-20)+y-40 = 0

21/4*x+y-105-40 = 0

21/4*x+y-145 = 0

21/4*x+y-145 = 0

21/4*x+y-145 = 0 // - y-145

21/4*x = -(y-145) // : 21/4

x = (-(y-145))/21/4

x = 4/21*(145-y)

x = 4/21*(145-y)

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