Question 669235
Starting with
-4x - (-20) + 10x = 40
-4x + 20 + 10x = 40
...
Combine like terms
6x + 20 = 40
{{{6x + cross(20) - cross(20) = 40 - highlight(20)}}}
6x = 20
{{{cross(6)x/cross(6) = 20/6}}}
x = {{{20/6 = 10/3}}} = 3 {{{1/3}}}
...
If starting with
-4x - 20 + 10x = 40
6x = 60
x = 10
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