(7x+20):(4x+30)=16:11
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(7x+20):(4x+30)=16:11(7x+20):(4x+30)=16:11(7x+20):(4x+30)=16:1111(7X+20)=16(4X+30)77x+220=64x+48013x
(7x+20):(4x+30)=16:11
(7x+20):(4x+30)=16:11
(7x+20):(4x+30)=16:11
11(7X+20)=16(4X+30)
77x+220=64x+480
13x=260
x=20
(7x+20):(4x+30)=16:11
11(7x+20)=16(4x+30)
77x+220=64x+480
77x-64x=480-220
13x=260
x=20
解 16x(4x+30)=11(7x+20)
64x+480 =77x+220
13x =260
x=20
11(7X+20)=16(4X+30)
77x+220=64x+480
13x=260
x=20