Solve and check the linear equation.

0.40x - 0.20(50 + x) = -0.04(50)

0.40x-10-0.20x=-2

0.20x = 8

x = 40

plug in x = 40

left = 0.40*40-0.20*(90) = 16-18 = -2

right hand side = -0.04*50 = -2

left = rigth

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