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(2*(x+30))/3+(2*(x+30))/3+x-15+30 = 0
(2*(x+30))/3+(2*(x+30))/3+(3*x)/3+(-15*3)/3+(3*30)/3 = 0
2*(x+30)+2*(x+30)+3*x-15*3+3*30 = 0
4*x+3*x-45+90+120 = 0
7*x-45+90+120 = 0
7*x+75+90 = 0
7*x+165 = 0
(7*x+165)/3 = 0
(7*x+165)/3 = 0 // * 3
7*x+165 = 0
7*x+165 = 0 // - 165
7*x = -165 // : 7
x = -165/7
x = -165/7
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