23 + 2X = 5
2X = -18
X = -9
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2x + 7 = 30 - 7 - 7 2x = 23 x = 23/2 x = 11.5
is equal to -23 -2*x
If you mean... -7+x*2=23 then x = 15. Done without the aid of a calculator ! The value of 'x' (the unknown number) MUST equal 30, because 30-7=23 - SO, half the unknown number must be 15!
To find one tenth of a number, multiply the number by 0.1. For example, one tenth of 23 is equal to 23 x 0.1 = 2.3
Find the square root of 23. The second one is the same number with a negative sign.