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<=> 2x - 5x = (-11) -7
<=> -3x = -18
<=> x = -18 ÷ -3
<=> x = 6
Himpunan Persamaan= {6}
Maaf ya.. yg no. 2 aq kurang tau..
Semoga Membantu((:
7 + 11 = 5x - 2x
18 = 3x
x = 18/3
x = 6
2. 2x + 60 + x = 180
2x + x = 180 - 60
3x = 120
x = 120/3
x = 40