2(-20)+3(-25)+5(20)+4(50)=x

Solution for 2(-20)+3(-25)+5(20)+4(50)=x equation:

2(-20)+3(-25)+5(20)+4(50)=x

We simplify the equation to the form, which is simple to understand 
2(-20)+3(-25)+5(20)+4(50)=x

Reorder the terms in parentheses
+(-40)+3*(-25)+5*(20)+4*(50)=x

Remove unnecessary parentheses
-40+3+*(-25+)+5+*(+20+)+4+*(+50+)=+x

Reorder the terms in parentheses
-40+(-75)+5*(20)+4*(50)=x

Remove unnecessary parentheses
-40-75+5+*(+20+)+4+*(+50+)=+x

Reorder the terms in parentheses
-40-75+(+100)+4*(50)=x

Remove unnecessary parentheses
-40-75+100+4+*(+50+)=+x

Reorder the terms in parentheses
-40-75+100+(+200)=x

Remove unnecessary parentheses
-40-75+100+200=+x

We move all terms containing x to the left and all other terms to the right. 
-1x=+40+75-100-200

We simplify left and right side of the equation. 
-1x=-185

We divide both sides of the equation by -01 to get x. 
x=185