Solution equation: 4x - (20-x) = 60 | Math enthusiast | Mathematical art

Solution equation: 4x - (20-x) = 60

4x-(20-x)=60
4x-20+x=60
5x=60+20
5x=80
x=16

The solution equation: 20% × 400 ÷ (400 + x) = 8%

Simplification of the original equation
80÷（400+x）=0.08
80=32+0.08x
0.08x=48
x=600

Twenty one out of 25 = five out of seven divided by 60% to solve the equation

21x out of 25 = X5 / 3 out of 7
21 / 25 x = 21 / 25
x=1

X divided by 5 + 60 - x divided by 18 = 5.5

x/5 +60 - x/18 =5.5
Same as x 90
18x +5400 - 5x =495
13x=-4905
x= -4905/13

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