0.30x - 0.20(60 + x) = -0.15(60)?

0.3x - 0.2(60 + x) = -0.15(60)
0.3x - 0.2*60 - 0.2*x = -9
0.3x - 12 - 0.2x = -9
0.3x - 0.2x = -9 + 12
0.1x = 3
x = 3/0.1
x = 30

3x - 2(60 + x) = (- 15)(60)
3x - 120 - 2x = - 900
x = - 780

it's a easier q

answer is x=30

0.30x - 12 - x = -9
-0.70x - 12 = -9
-0.70x = 3
x = -4.2857