3x^2
x+7
There is NO solution, because there is NO equals sign. However, 5x + 3x add to 8x (simplified) Remember in Algebra 5x means '5' multiplied to 'x' and '3' multiplied to 'x'. The multiplication sign is never shown in algebra.
4x plus 7
X + X + X + X = 4x It is the same as 4 x X = 4x Think numbers . 3 + 3 + 3 + 3 = 12 = 4(3) or 4 x 3 = 12 = 4(3) In mathematics instead of writing a 'string of plusses(+), it is easier to write the number of plusses multiplied to the given number.
algebra
It is a quadratic expression that can be multiplied out to: x^2 +6x+8
If: 12 = x+6 Then: x = 6
x = 7
-50
It depends what x is. If you do not know the value of either variable it would be 2x.
It is 119822294085.12
That's an equation where x = 5