closeup image of two red hearts with a plus and equal sign on a white background, valentines day, valentines day

abstract addition background beautiful blackboard board calculated celebration class color concept couple creative day decoration design easy educate education elementary equal equation exactly for four green happy health heart holiday idea inclination knowledge learn lesson life love mathematics number object one passion pencil plus psia red relationships right romance romantic school science shape sign simple smart space study success successful symbol teacher technology valentine valentines wedding white wrong young