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(1/10)*(x-50) = 40 // - 40
(1/10)*(x-50)-40 = 0
1/10*(x-50)-40 = 0
1/10*(x-50)-40 = 0
1/10*x-45 = 0
1/10*x-45 = 0
1/10*x-45 = 0 // + 45
1/10*x = 45 // : 1/10
x = 45/1/10
x = 450
x = 450
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