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Answer 1 · 2018-01-03T14:21:25

#x=5#

#2x+10=20#
#2x=20-10#
#2x=10#
#x=10/2#
#x=5#

Answer 2 · 2018-01-03T18:22:25

Graphical interpritation...

For any of you that are interested...

The solution to this is where the lines # y = 20 # and #y = 2x+10# intersect, as both are equal...

Sketching:

enter image source here

We see they intersect (cross) where:

# color(red)(x = 5 #