0.3+0.2(10)=0.1(x+40)

Solution for 0.3+0.2(10)=0.1(x+40) equation:

0.3 + 0.2(10)=0.1(x+40)

We simplify the equation to the form, which is simple to understand 
0.3 + 0.2(10)=0.1(x+40)

Reorder the terms in parentheses
0.3+(+2)=0.1*(x+40)

Remove unnecessary parentheses
 + 0.3+2=0.1+*(+x+40+)

Reorder the terms in parentheses
0.3+2=+( + 0.1x+4)

Remove unnecessary parentheses
 + 0.3+2=0.1x+4

We move all terms containing x to the left and all other terms to the right. 
-0.1x=+4-0.3-2

We simplify left and right side of the equation. 
-0.1x=+1.7

We divide both sides of the equation by -00.1 to get x. 
x=-17