7x10=57x-10=5

1
Add 1010 to both sides.
7x=5+107x=5+10

2
Simplify  5+105+10  to  1515.
7x=157x=15

3
Divide both sides by 77.
x=157x=\frac{15}{7}

Done

Decimal Form: 2.142857

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