3x + 7x - 6 = 180
10x - 6 = 180
10x = 180 + 6
10X = 186
x = 186/18
x = 18,6
7.18,6 - 6 = 125
124 + 30 + a = 180
180 - 155 = a
25
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3x + 7x - 6 = 180
10x - 6 = 180
10x = 180 + 6
10X = 186
x = 186/18
x = 18,6
7.18,6 - 6 = 125
124 + 30 + a = 180
180 - 155 = a
25