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\left(5+15\right)^{2}\times 5=400x
Multiply both sides of the equation by 5.
20^{2}\times 5=400x
Add 5 and 15 to get 20.
400\times 5=400x
Calculate 20 to the power of 2 and get 400.
2000=400x
Multiply 400 and 5 to get 2000.
400x=2000
Swap sides so that all variable terms are on the left hand side.
x=\frac{2000}{400}
Divide both sides by 400.
x=5
Divide 2000 by 400 to get 5.