x(3)+x-4(1.50)+4(1.50)=55.80

Solution for x(3)+x-4(1.50)+4(1.50)=55.80 equation:

x(3)+x-4(1.50)+4(1.50)=55.80

We simplify the equation to the form, which is simple to understand 
x(3)+x-4(1.50)+4(1.50)=55.80

Reorder the terms in parentheses
+(+3x)+x-4*(1.50)+4*(1.50)=55.80

Remove unnecessary parentheses
+3x+x-4+*(+1.50+)+4+*(+1.50+)=+55.80

Reorder the terms in parentheses
+3x+x+(-6)+4*(1.50)=55.80

Remove unnecessary parentheses
+3x+x-6+4+*(+1.50+)=+55.80

Reorder the terms in parentheses
+3x+x-6+(+6)=55.80

Remove unnecessary parentheses
+3x+x-6+6=+55.80

We move all terms containing x to the left and all other terms to the right. 
+3x+1x=+55.8+6-6

We simplify left and right side of the equation. 
+4x=+55.8

We divide both sides of the equation by 4 to get x. 
x=13.95