Different queries require different methods for their solution. The question is too vague to be answered here.
19
In math problems without punctuation such as brackets, the standard convention in to solve from left to right. Therefore, you would solve the problem 15-3 times 4 plus nine like by three actions. 15-3 equals 12; 12 times 4 equals 48; 48 plus 9 equals 57.
15-27
5
15 = 8x2 - 14x; whence, 8x2 - 14x - 15 = (2x - 5)(4x + 3) = 0. Therefore, x = 5/2 or -3/4.
3.75
The link below will help you.
5/3 - 4/5 = 25/15 - 12/15 = 13/15
x = 3*0.4 = 1.2
subtract 15 from both sides then divide both sides by -4. g=12
80 = 3y + 2y + 4 + 1 75 = 5y 15 = y y = 15
(25/100) x 15 = 3.75 or 15 x 0.25 = 3.75 or 15 x 1/4 = 3.75
15
Ill show you some examples: Ex. 1:3x + 4 - x + 16 + 12x(4 + 16) + 3x - x +12x20 + 2x + 12x20 + 14xEx. 2:15 - 12x + 4 - 2 + 6x(15+4-2) - 12x + 6x(19-2) - 12x + 6x17 - 18xTo solve these problems, first group like numbers. Then solve the problem until you can't solve anymore!
4b + 3 = 15 First, Subtract 3 from both sides. -3 -3 4b = 12 Then, divide by 4 to get b by itself. 4 4 b = 3
19
15-27