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.4(92)+.4(87)+.2(x)=90
We simplify the equation to the form, which is simple to understand
.4(92)+.4(87)+.2(x)=90
Reorder the terms in parentheses
+(+36.8)+.4*(87)+.2*(x)=90
Remove unnecessary parentheses
+36.8+.4+*(+87+)+.2+*(+x+)=+90
Reorder the terms in parentheses
+36.8+(+34.8)+.2*(x)=90
Remove unnecessary parentheses
+36.8+34.8+.2+*(+x+)=+90
Reorder the terms in parentheses
+36.8+34.8+( + 0.2x)=90
Remove unnecessary parentheses
+36.8+34.8 + 0.2x=+90
We move all terms containing x to the left and all other terms to the right.
+ 0.2x=+90-36.8-34.8
We simplify left and right side of the equation.
+ 0.2x=+18.4
We divide both sides of the equation by 0.2 to get x.
x=92
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