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(-1/4)*x+40 = 5-2*x // - 5-2*x
(-1/4)*x-(-2*x)-5+40 = 0
(-1/4)*x+2*x-5+40 = 0
7/4*x+35 = 0 // - 35
7/4*x = -35 // : 7/4
x = -35/7/4
x = -20
x = -20
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