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(0.2x-0.1)(0.5x-5)-0.25x(0.4x+0.2)=12.6
We move all terms to the left:
(0.2x-0.1)(0.5x-5)-0.25x(0.4x+0.2)-(12.6)=0
We add all the numbers together, and all the variables
(0.2x-0.1)(0.5x-5)-0.25x(0.4x+0.2)-12.6=0
We multiply parentheses
-0x^2+(0.2x-0.1)(0.5x-5)-0x-12.6=0
We multiply parentheses ..
-0x^2+(+0x^2+0x-0x+0.5)-0x-12.6=0
We add all the numbers together, and all the variables
-1x^2+(+0x^2+0x-0x+0.5)-1x-12.6=0
We get rid of parentheses
-1x^2+0x^2+0x-0x-1x+0.5-12.6=0
We add all the numbers together, and all the variables
-1x-12.1=0
We move all terms containing x to the left, all other terms to the right
-x=12.1
x=12.1/-1
x=-12+0.1/1
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