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15*x-(20*((5/15)*x-4/15)) = 7 // - 7
15*x-(20*((5/15)*x-4/15))-7 = 0
15*x-20*((5/15)*x-4/15)-7 = 0
15*x-20*(1/3*x-4/15)-7 = 0
15*x-20*(1/3*x-4/15)-7 = 0
25/3*x-7+16/3 = 0
25/3*x-5/3 = 0
25/3*x-5/3 = 0
25/3*x-5/3 = 0 // + 5/3
25/3*x = 5/3 // : 25/3
x = 5/3/25/3
x = 1/5
x = 1/5
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