x+10=20
then you subtract 10 from both sides
x=10
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it means that x should equal 10. x + x = 20. x = 10
20 as 10 x 0 = 0 so is just 10 + 10 = 20
(20 * x) + 3 = 5 20 * x = 2 x = 1/10
x=6=x=5+x=13+x=20 x cannot = x+5. This question has no answer.
2x2+18x = 20 2x2+18x-20 = 0 x2+9x-10 = 0 (x+10)(x-1) = 0 x = -10 or x = 1