3x + 8 = 20
3x = 20 - 8
3x = 12
3x = 12/3
x = 4
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It is an equation in the form of: 3x+5 = 20 and the value of x works out as 5
x2-5-4x2+3x = 0 -3x2+3x-5 = 0 or as 3x2-3x+5 = 0
If: 3x+2y = 5x+2y = 14 Then: 3x+2y = 14 and 5x+2y =14 Subtract the 1st equation from the 2nd equation: 2x = 0 Therefore by substitution the solutions are: x = 0 and y = 7
3x + 2y = 12 ie 2y = 12 - 3x so y = 6 - 3x/2
It is a mathematical equation, usually written like this: 5x - 7 + 2x = 3x - 2 + 4x