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(1/2)*(x-30) = 75 // - 75
(1/2)*(x-30)-75 = 0
1/2*(x-30)-75 = 0
1/2*(x-30)-75 = 0
1/2*x-90 = 0
1/2*x-90 = 0
1/2*x-90 = 0 // + 90
1/2*x = 90 // : 1/2
x = 90/1/2
x = 180
x = 180
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