10+5x=2510+5x=25

1
Subtract 1010 from both sides.
5x=25105x=25-10

2
Simplify  251025-10  to  1515.
5x=155x=15

3
Divide both sides by 55.
x=155x=\frac{15}{5}

4
Simplify  155\frac{15}{5}  to  33.
x=3x=3

Done

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