(84+74+70+64+x)除5+3.2=x x=?

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(84+74+70+64+x)除5+3.2=x x=?
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(84+74+70+64+x)除5+3.2=x x=?
(84+74+70+64+x)除5+3.2=x x=?

(84+74+70+64+x)除5+3.2=x x=?
(84 + 74 + 70 + 64 + x)÷5 + 3.2 = x
(292 + x)÷5 = x - 3.2
292 + x = 5(x - 3.2)
292 + x = 5x - 16
5x - x = 292 + 16
4x = 308
x = 308÷4
x = 77