\[2x-10=15\]
1
Add 1010 to both sides.
2x=15+102x=15+10

2
Simplify  15+1015+10  to  2525.
2x=252x=25

3
Divide both sides by 22.
x=252x=\frac{25}{2}

Done

Decimal Form: 12.5

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