If it's not what You are looking for type in the equation solver your own equation and let us solve it.
21y^4=()(7y^3)21
We move all terms to the left:
21y^4-(()(7y^3)21)=0
We do not support eypression: y^4
| -8x+2=15-2x | | (13x+5)=(8x-14) | | 8x+7+10=6x+3-2x | | 55+7=115+5x | | (13x+5)=(8x-14 | | 72-46=3x-7 | | 8x+3+10=6x+7-2x | | (50-2x)(40-2x)*x=6000 | | 6x+3+2x=8x+7-10 | | 2y=3=7 | | -8(-2-7r)=268 | | -2v=-34 | | 7m+12=-40 | | 3p-7(6p+5=-4(5p+4) | | 589=7X84+n | | F(52)=x | | z3− 1=3 | | -14=4z+6 | | 21=x/5+7 | | 38-x=51 | | 9=3a-12 | | 7(2x-3)+9-15x=1 | | 22=2-c | | 4b−3=13 | | -6x-4;x=-1 | | 126+5x+6=180 | | -2x-2=-4x-4 | | m+2/3=2m-1 | | B+(b+45)+1.5b+b+(2b-90)+90=540 | | 1/6/(x-5)=1/2(x+6) | | 10x-1=5x | | -7x-4;=-1 |