Answer
x = 6.4
Work Step by Step
2x -4.2 =8.6
2x -4.2 + 4.2 =8.6 + 4.2
2x =12.8
$\frac{2x}{2}$=$\frac{12.8}{2}$
x=6.4
Check
Replace x with 6.4
2x -4.2 =8.6
2$\times$ 6.4-4.2 =8.6
12.8 -4.2=8.6
8.6=8.6
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