6+7x=90 - solution

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Solution for 6+7x=90 equation:

x in (-oo:+oo)

7*x+6 = 90 // - 90

7*x-90+6 = 0

7*x-84 = 0 // + 84

7*x = 84 // : 7

x = 84/7

x = 12

x = 12

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