its solving equality where you should find the value of x
3x+x=180
you should equate the equation in which the constant value is in the one side of the equation and the variables are in the another side
4x=180
4x/4=180/4
x=45
you could use checking to be sure wethear ur answer balance the equation
3x+x=180
3(45)+45=180
135+45=180
180=180
that means that 45 is the exact value of x ;)
