Please help me! N1341

Question

Please help me! N1341

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Answer 1

А) -20(х-13)=-220
-20х+260=-220
-20х=-480
х=24

б)(30-7х)8=352
240-56х=352
-56х=352-240
-56х=112
х=-2

в)
г) (2,8-0,1х)3,7=7,4
10,36-0,37х=7,4
-0,37х=7,4-10,36
-0,37х=-2,96
х=8


больше не успеваю