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(2x)+(x+40)+(4x+35)= 180
2x+x+4x + 40+35 = 180
7x +75 =180
7x= 180-75
7x=105
x= 105/7 = 15
jadi nilai x adalah 15
180 = 2x + x + 40 + 4x + 35
180 = 7x + 75
(75 pindah ke ruas kiri, maka menjadi minus 75 / (-75)
180 - 75 = 7x
105 = 7x
maka x = 105 : 7 = 15
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