Ответ:
Объяснение:
1) 3(7x-0.3)=14x+1.9
21x-0.9=14x+1.9
21x-0.9+0.9=14x+1.9+0.9
21x=14x+2.8
21x-14x=14x-14x+2.8
7x=2.8
x=0.8
2) 0.7x-5(0.2x+1)=0.5x+15
0.7x-x-5=0.5x+15
-0.3x-5=0.5x+15
-0.3x-5+5=0.5x+15+5
-0.3x=0.5x+20
-0.3x-0.5x=20
-0.8x=20
x=-25
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Answers & Comments
Ответ:
Объяснение:
1) 3(7x-0.3)=14x+1.9
21x-0.9=14x+1.9
21x-0.9+0.9=14x+1.9+0.9
21x=14x+2.8
21x-14x=14x-14x+2.8
7x=2.8
x=0.8
2) 0.7x-5(0.2x+1)=0.5x+15
0.7x-x-5=0.5x+15
-0.3x-5=0.5x+15
-0.3x-5+5=0.5x+15+5
-0.3x=0.5x+20
-0.3x-0.5x=20
-0.8x=20
x=-25