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(1/4)*(70*x-(30*(X-2))) = 0
(1/4)*(70*x-30*(X-2)) = 0
1/4*(70*x-30*(X-2)) = 0
70*x-30*(X-2) = 0
70*x-30*(X-2) = 0
70*x-30*X+60 = 0
70*x-30*X+60 = 0
1/4*(70*x-30*X+60) = 0
( 1/4 )
1/4 = 0
x belongs to the empty set
( 70*x-30*X+60 )
70*x-30*X+60 = 0 // - 60-30*X
70*x = -(60-30*X) // : 70
x = (-(60-30*X))/70
x = (-(60-30*X))/70
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