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2014-11-07T17:35:18+02:00
6(x+3)=42 => x+3=7 => x=4
9(3x+5)=72 => 3x+5=8 =>3x=3 => x=1
16(x-7)=32 => x-7=2 => x=9.
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2014-11-07T17:37:02+02:00
6x+18=42
6x=42-18
6x=24
x=24:6=4

27x+45=72
27x=72-45
27x=27
x=27:27=1

16x-112=32
16x=32+112
16x=144
x=144:16=9

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