(90-x)=(180-x)/3

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Solution for (90-x)=(180-x)/3 equation: 


x in (-oo:+oo)

90-x = (180-x)/3 // - (180-x)/3

90-((180-x)/3)-x = 0

(-1*(180-x))/3-x+90 = 0

(-1*(180-x))/3+(3*(-x))/3+(3*90)/3 = 0

3*(-x)-1*(180-x)+3*90 = 0

270-2*x-180 = 0

90-2*x = 0

(90-2*x)/3 = 0

(90-2*x)/3 = 0 // * 3

90-2*x = 0

90-2*x = 0 // - 90

-2*x = -90 // : -2

x = -90/(-2)

x = 45

x = 45

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