0,1x + 9 = -0,2x - 3
0,1x + 0,2x = -3 - 9
0,3x = -12
x = -12 ÷ 0,3
x = -120 ÷ 3
x = -40
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0,1x + 9 = -0,2x - 3
0,1x + 0,2x = -3 - 9
0,3x = -12
x = -12 ÷ 0,3
x = -120 ÷ 3
x = -40