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4(t+20)=1/5(20t+400)
We simplify the equation to the form, which is simple to understand
4(t+20)=1/5(20t+400)
Simplifying:
4*(t+20)=0.2*(20t+400)
Reorder the terms in parentheses
+(+4t+80)=0.2*(20t+400)
Remove unnecessary parentheses
+4t+80=0.2+*(+20t+400+)
Reorder the terms in parentheses
+4t+80=+(+4t+80)
Remove unnecessary parentheses
+4t+80=+4t+80
We move all terms containing t to the left and all other terms to the right.
+4t-4t=+80-80
We simplify left and right side of the equation.
t=0
0=0
This equation is an identity, so all real numbers are solutions.
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