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(2*(x+30))/3+(2*(x+30))/3+x-15+30 = 175 // - 175
(2*(x+30))/3+(2*(x+30))/3+x-175-15+30 = 0
(2*(x+30))/3+(2*(x+30))/3+(3*x)/3+(-175*3)/3+(-15*3)/3+(3*30)/3 = 0
2*(x+30)+2*(x+30)+3*x-175*3-15*3+3*30 = 0
4*x+3*x-525-45+90+120 = 0
7*x-525-45+90+120 = 0
7*x-405-45+90 = 0
7*x-450+90 = 0
7*x-360 = 0
(7*x-360)/3 = 0
(7*x-360)/3 = 0 // * 3
7*x-360 = 0
7*x-360 = 0 // + 360
7*x = 360 // : 7
x = 360/7
x = 360/7
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