2x4=102x-4=10

1
Add 44 to both sides.
2x=10+42x=10+4

2
Simplify  10+410+4  to  1414.
2x=142x=14

3
Divide both sides by 22.
x=142x=\frac{14}{2}

4
Simplify  142\frac{14}{2}  to  77.
x=7x=7

Done

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