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(1/4)*(x-30) = 70 // - 70
(1/4)*(x-30)-70 = 0
1/4*(x-30)-70 = 0
1/4*(x-30)-70 = 0
1/4*x-155/2 = 0
1/4*x-155/2 = 0
1/4*x-155/2 = 0 // + 155/2
1/4*x = 155/2 // : 1/4
x = 155/2/1/4
x = 310
x = 310
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