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| (1)1.4:x=14:10, 14x=1.4×10, 14x÷14=14÷14, x=1; (2)x:(3+x)=3:4, 4x=3×(3+x), 4x=9+3x, 4x-3x=9+3x-3x, x=9; (3)
x=
(4)
8×(x+1)=5×(x+3), 8x+8=5x+15, 8x+8-5x=5x+15-5x, 3x+8-8=15-8, 3x÷3=7÷3, x=
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(2)
=
(3)x:6=0.7:0.28(4)20:3=50:x
