7x+4+2x=85 - solution

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Solution for 7x+4+2x=85 equation:

x in (-oo:+oo)

7*x+2*x+4 = 85 // - 85

7*x+2*x-85+4 = 0

9*x-81 = 0 // + 81

9*x = 81 // : 9

x = 81/9

x = 9

x = 9

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