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Verified answer
PLSV3 (5x + 7) = 9x - 15
15x + 21 = 9x - 15
15x - 9x = -15 - 21
6x = -36
x = -6
a = -6
maka, nilai 2a - 7
⇒ 2a - 7
⇒ 2 (-6) - 7
⇒ -12 - 7
⇒ -19
Semoga Membantu!!!
Verified answer
Jawabannya:3×(5x+7)= 9x-15
(3×5x)+(3×7)= 9x-15
15x+21=9x-15
15x-9x=-15-21
6x=-36
x(a)=-6
Maka:
2a-7→ 2(-6)-7→ -19
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