Question

Cum rezolv ecuatia x•25+(51-3x)•30+2x•35=1590. Va rooog...am nevoie de rsp repede. Mersi ;)

Answer 1

$x\cdot25+(51-3x)\cdot30+2x\cdot35=1590 \\ 25\cdot x + 30\cdot 51-3\cdot 30\cdot x+ 2\cdot35\cdot x=1590 \\ x\cdot(25-3\cdot 30+2\cdot 35) +30\cdot 41 = 1590 \\ x\cdot (25-90+70)+1230 = 1590 \\ x\cdot5 = 1590 - 1230 \\ 5\cdot x = 340 \\ x = 340:5 \\ \boxed{x = 68}$

Answer 2

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