(7+2.3-x)÷2=3.1

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(7+2.3-x)÷2=3.1
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(7+2.3-x)÷2=3.1
(7+2.3-x)÷2=3.1

(7+2.3-x)÷2=3.1
(7+2.3-x)÷2=3.1
= (9.3-x)÷2=3.1
=(9.3+x)÷2×2=3.1×2
= 9.3+x=6.2
= 9.3+x-x=6.2-x
= 9.3=6.2-x
= 9.3+6.2=6.2-x+6.2
= x=15.5