(x+1.9)*12=31.2 3.8x+0.5*3=11

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(x+1.9)*12=31.23.8x+0.5*3=11(x+1.9)*12=31.23.8x+0.5*3=11(x+1.9)*12=31.23.8x+0.5*3=11(x+1.9)*12=31.2x

(x+1.9)*12=31.2 3.8x+0.5*3=11
(x+1.9)*12=31.2 3.8x+0.5*3=11

(x+1.9)*12=31.2 3.8x+0.5*3=11
(x+1.9)*12=31.2
x+1.9=2.6
x=0.7
3.8x+0.5*3=11
3.8x=11-1.5
3.8x=9.5
x=2.5