11
-5 + 10b = -3110b = -26b = -2.6
N=3.1
11
y = 5
Any number multiplied by zero is zero. (10b also means 10 times zero.)
b = 6
division (divide 19 into 646)
-9.959999999999999
The subtraction of equality.
10b
Not sure that you can slove anything. -2w = r + s is one linear equation in 3 unknown variables. You need three independent equations in 3 variables to be able to solve them.