1) а) 11 + 2х = 55 + 3х;
2х-3х=55-11
-х=44
х=-44
б) –15 – 3х = –7х + 45;
-3х+7х=45+15
4х=60
х=60:4
х=15
в) –3х – 17 = 8х – 105.
-3х-8х=-105+17
-11х=-88
х=-88:(-11)
х=8
2) а) 2(2 + y) = 19 – 3y;
4+2у=19-3у
2у+3у=19-4
5у=15
у=15:5
у=3
б) (4 – c) + 2(c – 3) = –13;
4-с+2с-6=-13
-с+2с=-13-4+6
с=-11
в) –3(3b + 1) – 12 = 1
-9b-3-12=1
-9b=1+3+12
-9b=16
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Answers & Comments
1) а) 11 + 2х = 55 + 3х;
2х-3х=55-11
-х=44
х=-44
б) –15 – 3х = –7х + 45;
-3х+7х=45+15
4х=60
х=60:4
х=15
в) –3х – 17 = 8х – 105.
-3х-8х=-105+17
-11х=-88
х=-88:(-11)
х=8
2) а) 2(2 + y) = 19 – 3y;
4+2у=19-3у
2у+3у=19-4
5у=15
у=15:5
у=3
б) (4 – c) + 2(c – 3) = –13;
4-с+2с-6=-13
-с+2с=-13-4+6
с=-11
в) –3(3b + 1) – 12 = 1
-9b-3-12=1
-9b=1+3+12
-9b=16