20=2x−(10−4x)20=2x-(10-4x)
1
Remove parentheses.
20=2x−10+4x20=2x-10+4x

2
Simplify  2x−10+4x2x-10+4x  to  6x−106x-10.
20=6x−1020=6x-10

3
Add 1010 to both sides.
20+10=6x20+10=6x

4
Simplify  20+1020+10  to  3030.
30=6x30=6x

5
Divide both sides by 66.
306=x\frac{30}{6}=x

6
Simplify  306\frac{30}{6}  to  55.
5=x5=x

7
Switch sides.
x=5x=5

Done

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