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(1/2)*(138-x) = 36 // - 36
(1/2)*(138-x)-36 = 0
1/2*(138-x)-36 = 0
1/2*(138-x)-36 = 0
33-1/2*x = 0
33-1/2*x = 0
33-1/2*x = 0 // - 33
-1/2*x = -33 // : -1/2
x = -33/(-1/2)
x = 66
x = 66
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